The color of the mineral in its powdered form.

• fracture

• tenacity

• streak

• luster

Includes all life forms, even organic matter that has not yet decomposed.

• hydrosphere

• geosphere

• atmosphere

• biosphere

The coldest layer of the Earth's atmosphere.

• troposphere

• stratosphere

• mesosphere

• exosphere

The weather sphere.

• troposphere

• stratosphere

• mesosphere

• exosphere

Tap into heat close to the Earth's surface to heat water or provide heat for buildings.

• Hydroelectric power plant

• Geothermal heat pumps

• Geothermal power plant

• Hydrothermal heat pumps

The following criteria define a mineral, EXCEPT

• solid

• naturally occurring

• inorganic

• man-made

They are formed by the crystallization of molten magma.

• igneous rocks

• sedimentary rocks

• metamorphic rocks

• clastic rocks

Earth’s first photo-synthesizers, making food using water and the Sun’s energy.

• euglena

• cyanobacteria

• algae

• paramecium

When a substance such as water is added to hot rocks, the melting points of the minerals within those rocks decreases.

• partial melting

• volatile melting

• flux melting

• decompression melting

The cleanest, odorless, and colorless fossil fuel.

• natural gas

• peat

• coal

• oil