Diatomaceous earth is made from the fossilized remains of tiny, aquatic organisms called diatoms. Their skeletons are made of a natural substance called silica. Over a long period of time, diatoms accumulated in the sediment of rivers, streams, lakes, and oceans.

Eight 12'' x 15'' models present a visual record of hundreds of geologic features. Each keyed model relates typical surface formations to subsurface structures shown in cross section. Includes the following: Coastline of Submergence, Volcanism, Fault Block Mountains, Alpine Glaciation, Dome Mountains, Continental Glaciation, Folded Mountains, and Coastal Plain. A study guide describes each model, identifies key features, outlines demonstrations, and lists student projects.

This set of seven plastic-formed maps of real U.S. locations is colored and detailed to best relate a variety of topographical features to the underlying geology, including erosional/depositional environments. The study guide gives a synopsis of each region, with keyed photos noting important features. Contents: Yakima, WA -Hoquiam, WA/OR -Portland, ME/NH, Harrisburg, PA -Grand Canyon, AZ -Death Valley, CA/NV -and Monterey, CA.

This model is a large, full-color 3D relief map of the North Atlantic Ocean showing a portion of the ocean floor with its variation in land forms. Students can identify all the major ocean features on this single map: continental shelf, continental slope, mid-ocean ridges, basins, canyons, trenches, islands, seamounts, and troughs. Students may fill the the map model with water to observe where islands will appear above the ocean surface.

This globe comes with Velcro ‘continental fragments’ which can be arranged via fasteners to reconstruct their positions through geological time. It also comes with a guide, as well as some background information on continental drift and plate tectonics.

One half of this 12'' relief globe can be detached at the equator to expose the Earth’s crust, mantle, outer core, and inner core. A removable, clear plastic disk rests on the cross section, detailing atmospheres, temperatures, air densities, and distances of each inner layer. The surface can be written on. The globe comes with an illustrated study guide.

This 3D weather model has been designed to demonstrate basic air mass structures and explain relationships between cloud types, precipitation, temperature, pressure, and warm and cold fronts. After these relationships have been studied and the direction and speed of the fronts has been determined, it is possible to forecast the weather for various locations and times on the model.

A compass tells directions by means of a magnetic needle pointing north.

A barometer measures atmospheric pressure and is used to forecast the weather

This cloud apparatus is used to demonstrate the formation of clouds. The rubber bulb is partially filled with water then compressed to force air from the flask. The flask is then filled with smoke by holding the open tube near a smoking match and releasing the bulb. After closing the tubing clamp, a cloud can be formed in the flask by compressing and suddenly releasing the bulb.

This poster includes photographs of different types of clouds along with descriptions of the clouds, how they form, and what they mean weatherwise.

This three-dimensional model creates a water cycle as it occurs in nature. The model actually causes the rain to fall, then evaporate in a continuous cycle. It also graphically shows distillation of water as it changes to gas. Students can examine the evaporation and condensation process within the plastic model.

This Tornado Tube offers a scientific explanation of the powerful spiraling forces behind hurricanes and tornadoes. Two plastic soda bottles are needed but not included.

Use this turbine to teach students about wind energy. Students can design turbine blades for it and test power output with a multimeter.

**Grades 4-12 only

This three dimensional model is a great way to explore the solar system with your students.

This poster includes information about our solar system.

A direct-reading replica diffraction grating instrument used for viewing visible line and absorption spectra. A scale, illuminated by an adjustable white-faced reflector, indicates approximate wavelengths. Constructed of a single piece of aluminum casting mounted on a nickel-plated steel post and cast-iron tripod. Complete with instructions.