Earth and Moon Test Review

How can scientists determine the internal structure of the Earth?

• Cores have been drilled down through the Earth's layers

• Seismic waves travel differently through different kinds of material.

• Volcanoes bring up material from the various layers.

• It's purely a guess. There is no evidence.

What evidence do we have that Earth's magnetic poles periodically reverse?

• Records kept by 17th century sailors show reversals.

• Microscopic iron in the lava align with the magnetic fields as it cools

• Samples taken from the Earth's core show the magnetic field lines changing over time.

• Earth's magnetic fields don't reverse. This only happens on other planets.

Tidal interactions between the Earth and Moon will cause:

• the Earth's rotation to slow and the Moon to move closer.

• the Earth's rotation rate to increase and the Moon to move closer.

• the Earth's rotation rate to increase and the Moon to move farther away.

• the Earth's rotation to slow and the Moon to move farther away.

What happened to Earth's primary atmosphere of hydrogen and helium?

• It escaped into space because Earth is too small and too warm for that kind of atmosphere.

• It was absorbed into Earth's oceans.

• It's still up there, we just have more oxygen now.

• Earth never had those gasses in its atmosphere.

Earth's rotation and the Moon's gravitational pull on the oceans combine to produce

• two high tides per month.

• one high tide per day.

• one high tide per month.

• two high tides per day.

Why is Earth's magnetosphere important to our continued survival on this planet?

• It shields us from the solar winds.

• The magnetic field keeps the core molten, so tectonic activity continues.

• Magnetism keeps the greenhouse effect in balance.

• It keeps our compasses working so we can find our way home.

The ozone layer in Earth's upper atmosphere is important because it:

• is responsible for the greenhouse effect.

• absorbs ultraviolet radiation before it can reach the Earth's surface.

• keeps our atmosphere from being blown away by the solar wind.

• traps charged particles from the solar wind in two zones.

What are the Van Allen belts?

• Regions of wind flow related to the jet stream

• Convection zones in the upper mantle that produce tectonic activity.

• Upper-level clouds in the stratosphere

• Zones of high-energy particles in the magnetosphere

Which of the following statements is true about Earth's tectonic activity?

• It is most likely driven by convection within the Earth's mantle.

• It is mirrored in a similar pattern of activity on the Moon.

• It died out long ago as the crust of the Earth cooled.

• It is driven by changes in Earth's magnetosphere.

This is a boundary where the plates are pulling apart along a ridge which may show volcanic activity.

• Rift zone

• Subduction zone

• Fault zone

• Hot spot