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".
For use with 12046 What Rock Is It? classroom project.
A highly detailed eye model to satisfy beginning students. Dissectible into 7 parts that include: top section, vitreous body, bottom section, lens (2 parts), iris, cornea. Mounted on a stand. Includes keycard with 41 structures labeled. Enlarged 6 times. Size 5 1/2" x 6 1/4"
• ANSI Class 2 T-shirt.
• 2” Silver reflective tape.
• 100% ANSI Wicking Birdseye.
• 3.8 oz. fabric weight.
• Lightweight fabric provides comfort.
• Pocket: 1 left chest.
Elevate your workwear with our premium ANSI Class 2 T-shirts, designed to keep you safe and comfortable all day long. Featuring 2” silver reflective tape, these shirts ensure enhanced visibility even in low-light conditions. Crafted from 100% ANSI Wicking Birdseye fabric, they keep you cool and dry, providing superior comfort throughout your workday.
• Polyethylene bottle with polypropylene cap
• Excellent chemical resistance
• Features sealing plugs for leak-proof closure.
• Easy grip caps can be wired down for security.
• Head space between cap and insert plug can be used for confidential notes.
100ml Polyethylene bottle with polypropylene cap. Polyethylene bottles provide excellent chemical resistance and feature sealing plugs for leak-proof closure. Easy grip caps can be wired down for security. Head space between cap and insert plug can be used for confidential notes.
These polypropylene bottles are rigid, translucent and have excellent contact clarity. These bottles can be autoclaved filled as well as empty. The polypropylene cap has a built-in seal ring to make these bottles leak proof.
| Size | Height | Neck Diameter ID/OD |
Pack Size |
| 60ml | 73mm | 20mm / 25mm |
Pack of 12
|
| 125ml | 100mm | 27mm / 32mm |
Pack of 12
|
| 250ml | 137mm | 35mm / 41mm |
Pack of 12
|
| 500ml | 149mm |
35mm / 41mm |
Pack of 12
|
|
1000ml
|
218mm |
35mm / 41mm |
Pack of 6
|
Polypropylene Space saving, graduated bottles are ideal for long-term storage of samples. Easy grip caps can be wired down for security. Head space between cap and insert plug can be used for confidential notes.
1-14 Paper strips, change for each full pH unit,100 strips per vial.
Two plates 250mm in diameter are supported in two rigid uprights and driven by hand in opposite directions. They are heavy, high-resistance plastic with sectors of aluminum sheets. Leyden jars (condensers) made of borosilicate glass and aluminum foil store electricity until discharged by the dischargers. The whole unit is mounted on a wooden base.
This program explores the mechanics of measuring wind speed and direction as well as the use of wind as an energy source. Students will also learn how wind occurs by finding out about the roles of temperature, air pressure and the sun. Graphics and animation will clearly illustrate these patterns. Students will also learn how hot-air balloons work in this exciting look at weather's invisible force. One of six volumes in the Weather Fundamentals DVD Series in the Schlessinger Science Library. Part of the Schlessinger Science Library in Action Collection. This title correlates to the National Science Education Standards for Earth and Space Science -- structure of Earth's system, Earth's history and Earth in the solar system. A Teacher's Guide is included and available online that features additional information on the topic, vocabulary words, discussion questions, follow-up activities and lists of recommended books & Internet resources. 23 minutes. Grades 4 to 7.
• Personal safety & signaling device.
• 3 Tones (including Pealess Whistle) – Grey with Black trim
• Loud 105-dB
• Each set of AAA Batteries produces more than 1000 blasts
• Whistle sound can be aimed in the exact direction intended, and away from user
• Loud, Consistent Sound Every Time, even if user is short of breath or injured
• Hand operated instead of mouth blown is sanitary, even for multi users
Personal Safety & Signaling Device for Crossing Guards, Referees, Coaches, Hikers, Hunters, Campers, Senior Citizens, Joggers, and anyone who could benefit from carrying a whistle. Electronic whistles make it easier the user to give verbal commands without a Whistle in their mouth, yet with Whistle sound always “at the ready”.
Quickly removes insulation without damaging wire. Set screw adjusts stripper to fit wire gauges from 10 to 24. Made from drop-forged, heat treated steel with black baked enamel finish. PVC handles. Total length is 4 inches.
Hi-viz pink breakaway vest. Does not meet ANSI requirements. 2 interior open waist pockets that will hold a 5.5" cell phone. 100% polyester tricot. Hook & loop front closure. 2" AwareLite reflective trim.
• Lightweight, multi-season.
• Rainguard zipper closure with interior storm flap.
• Comfort collar, fleece-lined.
• Three fused fabric layers.
• Breathable, waterproof and wind resistant.
• Comfortable polyester/spandex outer shell fused with fleece liner.
• Two exterior slash pockets with rain guard zipper closure.
• Channeled hem with cinch cord and cord lock for adjustable fit.
• Deluxe adjustable cuffs.
• Contoured waist.
Women's Class 2 polyester bonded with fleece. Contoured waste for better fit. 3 fused fabric layers: soft outer shell, weather resistant middle and warm brushed fleece interior. Breathable, water and wind resistant. Comfortable polyester/spandex. Draw string hem with cord stopper. Black bottom hides dirt and grime. 2 zippered slash pockets. Adjustable sleeve cuffs. Zipper closure with tunnel collar. Conforms to ANSI 107 standard.
Designed for spherical mirrors and lenses. Support is 5" tall and has a 1.5" V-shaped grooved wedge to hold mirrors or lenses 38mm to 100mm securely in place.
Designed for spherical mirrors and lenses. Support is 5" tall and has a 1.5" V-shaped grooved wedge to hold mirrors or lenses 38mm to 100mm securely in place.
Well constructed. Hardwood. Test tube supports being made of 5/16" stock are much stronger than the ordinary grade. Post joints of the heavy base supports are glued and nailed top and bottom. All other supports assembled with dovetail joint. All supports finished in paraffin oil.
Well constructed. Hardwood. Test tube supports being made of 5/16" stock are much stronger than the ordinary grade. Post joints of the heavy base supports are glued and nailed top and bottom. All other supports assembled with dovetail joint. All supports finished in paraffin oil.
Prismatic reflectors for full, even light pattern, perfect for professional working conditions. Brighter beam with a 100% brighter Krypton bulb. Toolbox-tough polypropylene construction resists impact, gas, grease, chemicals, water, corrosion. Scratch-resistant, break-resistant lens. Full lifetime warranty. Made in the U.S.A. Switches torture-tested to 100,000 on/off cycles. Resistant to extremes of temperature and humidity. Uses 2 "D" Batteries.
• Lighter and more attractive than your old metal barricades
• Redirect traffic in unsafe and risky conditions
• Designed to warn and maintain a safe and friendly environment
• Easy to handle, store, and does not rust.
• Its durable recycled material allows for a sturdy and lasting effect
• 37" high and expand from 16.5" to 11.5'
• Requires minimal assembly
• weighs only 15 lbs. so it's easy to move from one location to another
• Mainly for indoor use
Replace your old metal barricade with the newest, latest, and greatest, plastic expandable barricade, XpanDit". XpanDit" will redirect traffic in unsafe and risky conditions and is designed to warn and maintain a safe and friendly environment. The XpanDit" is easy to handle, store, and does not rust. Its durable recycled material allows for a sturdy and lasting effect, and it is di-electric and heat resistant. Barricades are 37" high and expand from 16.5" to 11' 5" to accommodate nearly any space. Requires minimal assembly and weighs only 15 lbs. so it's easy to move from one location to another. Mainly for indoor use.
The perfect way to alert the public to hazards that are located in unlit or dimly lit areas. This highly visible tape comes with a liner.