Volcanoes are one of Earth's most fascinating and destructive forces. In Volcanoes, students will get an up-close look at these fiery formations, discovering how they form and what causes them to erupt. Learn the difference between magma and lava, and discover the characteristics that enable volcanologists to classify a volcano as cinder cone, shield or composite. Examine the anatomy of an active volcano, and learn about historical eruptions that have left a mark on our planet. A fun, hands-on investigation demonstrates how a tilt meter is used to predict when a volcano might erupt by charting changes in the slope of the surrounding ground, while a visit to Horseshoe Lake at Mammoth Mountain, California, highlights an invisible sign of volcanic activity -- poisonous carbon dioxide fumes. Part of the Earth Science in Action DVD Series. A teacher's guide is available online. 23 minutes. Grades 5 to 8.
• Economical solution for closing off areas for cleaning or when safety is a concern
• Wall mounts don't use floor space and are great for keeping unwanted traffic out
• Braking system and locking button to prevent accidental belt release
• Installation is simple and steel construction is durable for years of heavy use
• Span small or large openings with two different belt lengths – 8-foot or 13-foot
Quickly close off areas with these Wall Mounts with Retractable Belt. Wall mounts are the economical solution for crowd control because they do not take up floor space and are perfect for keeping unwanted traffic out. The retractable belt can span small or large openings with two different belt lengths. Installation is simple and the mount's steel construction is incredibly durable for years of heavy use. The wall mount includes safety features such as a belt braking system for slow and predictable belt return, and a locking button to prevent accidental belt release. Made in the USA. Available in two lengths and 3 styles.
• Damping belt-braking system ensures a slow and safe retraction every time
• Belt mechanism is easily replaced in the field using a screwdriver
• Belt end connects to all major manufacturers' stanchions
Wall-mounted Retractable Belt Barriers give you all the benefits of a portable stanchion without taking up valuable floor space. Wall-mounted Safety Barriers attach to the wall with inconspicuous connectors. Simply twist the screw on the connector to release and move to another location. Ideal for cash register closures, or closing off aisles, corridors, and doorways for cleaning or safety. The retractable belt attaches to a wall receptacle (included) mounted on an opposing wall or directly to a portable stanchion. Includes all hardware.
Comes with 10' belt. Belt available in black, red, burgundy, grey, bronze, blue, navy, olive green, forest green, silver/black, black/neon yellow, black/red, safety black/yellow, florescent yellow, or orange.
Includes specimens in the following areas: rock-forming minerals; ore-forming minerals; industrial minerals; and igneous, sedimentary, and metamorphic rocks. 40 specimens, 2" x 1 1/2". Comes in a compartmented container.
Includes specimens in the following areas: rock-forming minerals; ore-forming minerals; industrial minerals; and igneous, sedimentary, and metamorphic rocks. 40 specimens, 2" x 1 1/2". Comes in a compartmented container.
Washington Student Collection Designed to accompany the Washington School Collection. 40 unlabeled chips in a zip-lock storage bag.
Washington Student Collection Designed to accompany the Washington School Collection. 40 unlabeled chips in a zip-lock storage bag.
Made from clear glass sheet, (1.8 to 2.0 mm thick) fine ground and polished edges. Packed in boxes of 12.
These 125mm Watch Glasses are made from clear flint glass (1.8 to 2.0mm thick), and have fine ground and polished edges. Packed in boxes of 12.
Made from clear glass sheet, (1.8 to 2.0 mm thick) fine ground and polished edges. Packed in boxes of 12.
These 75mm Watch Glasses are made from clear flint glass (1.8 to 2.0mm thick), and have fine ground and polished edges. Packed in boxes of 12.
These snug fitting black rubber bases are made from recycled materials Bases are interchangeable with the Navicade™ or 42" Watchtower Stacker Cones. Available in 3 weight levels.
• Heavy duty 1" galvanized steel construction
• 8" rubber wheels
• Holds most coolers up to 10 gallons in size
• Comes with basket to hold cups, etc.
• For indoor use
• Measures 53" H x 27" W x 26' D
• Cooler not included
• Lifetime warranty!
• Made in the USA!
Cart enables you to transport and stage. Holds most coolers up to 10 gallons in size and 16" outside diameter. Comes with basket to hold cups, etc. Use indoors or out. Measures 53" H x 27" W x 26" D. Order cooler separately. Lifetime warranty applies to cart only
Water is vital to all life on Earth and covers nearly three-fourths of our planet's surface. Where does it come from? Will we use it up eventually? In The Water Cycle, students learn that Earth has the same water supply today as it did millions of years ago. Examine the amazing process by which water is continually recycled and transported from place to place through evaporation, condensation and precipitation. Also find out how energy from the sun drives the water cycle and how the atmosphere prevents water from slipping away from Earth. A fun, hands-on investigation demonstrates how an artesian well works, while a visit to a desalination plant showcases how salt water is purified. Part of the Earth Science in Action DVD Series. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.
The cycle of precipitation and evaporation is dramatically demonstrated for elementary and intermediate school students. Complete kit includes base tray holding an accurate and simulated varied landscape plus a lid with cloud simulator. All you do is add ice cubes and a heat source to create an exciting earth science demonstration. Also demonstrate distillation of water to gas. A truly dynamic teaching tool.
The cycle of precipitation and evaporation is dramatically demonstrated for elementary and intermediate school students. Complete kit includes base tray holding an accurate and simulated varied landscape plus a lid with cloud simulator. All you do is add ice cubes and a heat source to create an exciting earth science demonstration. Also demonstrate distillation of water to gas. A truly dynamic teaching tool.
Consists of four glass tubes of different shapes projecting vertically from a common horizontal tube, mounted on a stand. To demonstrate the principle that in connected vessels, the liquid rises to the same level irrespective of the shape of the vessel. All glass parts are made from Borosilicate Glass.
Consists of four glass tubes of different shapes projecting vertically from a common horizontal tube, mounted on a stand. To demonstrate the principle that in connected vessels, the liquid rises to the same level irrespective of the shape of the vessel. All glass parts are made from Borosilicate Glass.
Ideal field test kit for performing 4 important experiments on water pollution. Test water samples for dissolved oxygen content, chlorides, phosphates, and water hardness. This kit provides all the apparatus and materials necessary for performing each test several times. Comes complete with instruction booklet.
Set includes two helical springs and a length of cotton string. The long narrow spring measures 3/4" x 72", and can be extended to 5 meters. Larger spring measures 3" x 4". Can be extended many times its length without distortion. Includes activity guide. Shipping weight: 2.5 lbs.
Set includes two helical springs and a length of cotton string. The long narrow spring measures 3/4" x 72", and can be extended to 5 meters. Larger spring measures 3" x 4". Can be extended many times its length without distortion. Includes activity guide. Shipping weight: 2.5 lbs.
Spring measures 3" x 4". Can be extended many times its length without distortion.
Spring measures 3" x 4". Can be extended many times its length without distortion.
For demonstrating longitudinal and transverse wave motion. Consists of a number of eccentric aluminum discs supporting a series of metal rods, joined to a handle. On revolving the handle, simulation of waves can be obtained on the rods running in a metal guide. Mounted on a nicely polished wooden case.
For demonstrating longitudinal and transverse wave motion. Consists of a number of eccentric aluminum discs supporting a series of metal rods, joined to a handle. On revolving the handle, simulation of waves can be obtained on the rods running in a metal guide. Mounted on a nicely polished wooden case.
Create a weather station right in your classroom with these durable meteorological instruments. Students can measure and record barometric pressure, relative humidity and air temperature and record the trends, averages and highs and lows. The sturdy carrying case holds a 3" barometer, as well as three stands for using the instruments individually. An activity guide explains in detail how to use each instrument. Grades K-4.
Create a weather station right in your classroom with these durable meteorological instruments. Students can measure and record barometric pressure, relative humidity and air temperature and record the trends, averages and highs and lows. The sturdy carrying case holds a 3" barometer, as well as three stands for using the instruments individually. An activity guide explains in detail how to use each instrument. Grades K-4.
2 activities in 1. New design for use with dry-erase markers, wall-size chart (44" x 50") for integrated study and plotting of weather data. Map on one side locates U.S. reporting cities, includes forecast space and weather symbols. Chart on reverse side combines world map and 2 climagraphs for plotting comparative temperatures and precipitation. Study guide included.
2 activities in 1. New design for use with dry-erase markers, wall-size chart (44" x 50") for integrated study and plotting of weather data. Map on one side locates U.S. reporting cities, includes forecast space and weather symbols. Chart on reverse side combines world map and 2 climagraphs for plotting comparative temperatures and precipitation. Study guide included.
In combination with a detailed Teacher's Guide, this 16" x 12" x 3" 3-D model will help students understand weather fronts and other meteorological concepts. Students can conduct detailed studies of airmass structures, cloud types, precipitation, temperatures, pressure, and warm and cold fronts. Building upon this base of information, direction and speed of fronts can be measured, giving students the option of forecasting weather conditions for specific times and locations. Grades 4-12.
In combination with a detailed Teacher's Guide, this 16" x 12" x 3" 3-D model will help students understand weather fronts and other meteorological concepts. Students can conduct detailed studies of airmass structures, cloud types, precipitation, temperatures, pressure, and warm and cold fronts. Building upon this base of information, direction and speed of fronts can be measured, giving students the option of forecasting weather conditions for specific times and locations. Grades 4-12.
The rocks and soil that make up Earth's surface are constantly being affected by a variety of forces, ranging from heat and frost to water and wind. In Weathering and Erosion, students will discover the natural forces that cause weathering, erosion and deposition, and see the many effects that these processes have on Earth's surface. Students will examine natural structures around the world and see how weathering and erosion have affected them, while discovering ways in which people have become better prepared to battle these forces through conservation. In addition, a fun, hands-on experiment demonstrates how running water erodes different types of soil. Part of the Earth Science in Action DVD Series. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.
Hanging metric weights used to extend scale capacity of Ohaus 750-S0 and 750-SW metric triple-beam balances (not included). Cast iron construction has durability and long life. The set of three attachment weights includes two 1,000g weights and one 500g weight.
Calibration weights are used to measure the weight or mass of an object using a balance or scale, or to calibrate other weights or instruments. Calibration weights can be certified or uncertified. Certified weights meet strict guidelines for accuracy and can usually be recertified. Certified weights are used in labs where a high degree of accuracy and repeatability is required. Uncertified weights are used where a lower degree of accuracy is required, including student laboratories, rough weighting operations, and measuring force. Hooked and slotted weights are often used to measure pressure, torque, and tensile strength, and to demonstrate basic laws of physics. Calibration weights differ from lab weights, which are general purpose weights used to hold an object in place, similar to a paperweight.
Hanging metric weights used to extend scale capacity of Ohaus 750-S0 and 750-SW metric triple-beam balances (not included). Cast iron construction has durability and long life. The set of three attachment weights includes two 1,000g weights and one 500g weight. Calibration weights are used to measure the weight or mass of an object using a balance or scale, or to calibrate other weights or instruments. Calibration weights can be certified or uncertified. Certified weights meet strict guidelines for accuracy and can usually be recertified. Certified weights are used in labs where a high degree of accuracy and repeatability is required. Uncertified weights are used where a lower degree of accuracy is required, including student laboratories, rough weighting operations, and measuring force. Hooked and slotted weights are often used to measure pressure, torque, and tensile strength, and to demonstrate basic laws of physics. Calibration weights differ from lab weights, which are general purpose weights used to hold an object in place, similar to a paperweight.
• Made with 0.35mm thick PVC and polyester fabric
• Detachable hood with drawstring
• Storm flap front with snap closure
• 2 flapped front pockets with snap closures to secure valuables
• Cape vented back
• Corduroy collar for comfort
• Available in 4 Sizes
• Available with or without CROSSING GUARD Emblem on Back
This bright yellow rain jacket is made of tough .35mm PVC and polyester fabric. Corduroy lined collar for comfort. Coat has cape-vented back . Includes detachable hood.
| Chest | Length | Sleeve | |
| Medium | 56 in. | 30.5 in. | 32 in. |
| Large | 58 in | 31.5 in. | 33 in. |
| X-Large | 60 in. | 32 in. | 34 in. |
| 2X-Large | 62 in. | 33 in. | 35 in. |
In this step-by-step classroom project students examine and identify individual rock specimens. As each rock specimen is examined and identified, students progress toward the completion of their own rock reference charts. The Teacher's reference chart uses illustrations and actual specimens for students to consult as they identify unlabeled rock specimens. For grades 6-12.
This chart has illustrations and actual specimens for students to consult as they identify unlabeled rock specimens. For grades 6-12. 23 1/2" x 15 1/5".