Which of these rocks forms from lava that cools very quickly? a) schist b) gneiss c) granite d) obsidian

Which of these resources is used worldwide to make construction products, pottery, and porcelain

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.