"Avantor"

Abundant small black phenocrysts in a gray to brown matrix.

Dark gray with abundant gas pocket vesicles.

Pale pink felsite, with small sanidine phenocrysts.

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

The movement of liquid currents due to differences in temperature is demonstrated by introducing dye into the water in the tube. One corner of the tube is heated and the movement of the dye clearly establishes the currents. The rectangular shaped tube measures 15×21 cm and has an opening at the top.

The Plastic Inclined Plane is ideal for demonstrating resolution of forces, acceleration down a plane, work, potential energy, and friction.

Explain several concepts with a single activity.

Following a step-by-step procedure, students mark, label, and rotate the Earth to illustrate and answer questions on solar intensity, rotation, and revolution, and angles of radiation.

Introduce the concept of a simple electric circuit and show that a wire can carry electricity and how a switch can start and stop the current flow.

PE utility pails with lid.

Set of three undrilled balls.

Full Class Exploration of Ecosystems

This set of blocks, developed by Jodye Selco, is an excellent complementary set to Density Blocks I.

A Simple Alternative to Large Angle of Insolation Energy Labs

Basic Molecular Structure Shown in Three-Dimensional Model.

Measuring set with a variety of sizes.