Mid-Unit D Review

A volcano that is currently erupting, showing signs that it is likely to erupt in the near future, or has erupted in recorded history.

• Active Volcano

• Extinct Volcano

• Dormant Volcano

A volcano that has not erupted for at least 10,000 years, but that scientists think may erupt again.

• Active Volcano

• Extinct Volcano

• Dormant Volcano

Molten rock found on top of the earth's surface.

• Nuclear Waste

• Lava

• Magma

• Volcano

The rigid upper portion of the earth that is broken into plates. It includes the crust and the uppermost portion of the mantle. (All solid)

• Outer Core

• Inner Core

• Lithosphere

• Asthenosphere

A logically consistent explanation of some aspect of the natural world that is supported by a large body of evidence.

• Theory

• Suspicion

• Question

• Idea

A scientist who uses fossil evidence to study life in prehistoric times.

• Ecologist

• Paleontologist

• Hydrologist

• Geologist

This scientist proposed the theory of Continental Drift in 1915

• Eduard Suess

• Alexander du Toit

• Edward Bullard

• Alfred Wegener

The ESTIMATED distance from the earth's surface to the center of the earth is __________.

• 64 km

• 640 km

• 6,400 km

• 64,000 km

Continental drift is the idea that ______________.

• the continents are the only solid surface on the earth

• objects that fall into the ocean drift between the continents

• ocean waves push the continents over the surface of the earth

• the continents were once joined together to form a large land mass

Scientific evidence suggests that the earth is of years old.

• hundreds

• thousands

• billions

• millions