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Rank the five terrestrial worlds in order of size from smallest to largest:

Moon, Mercury, Mars, Venus, Earth.

The core, mantle, and crust of a planet are defined by differences in their


The lithosphere of a planet is the layer that consists of

the rigid rocky material of the crust and uppermost portion of the mantle.

What is the most important factor that determines the thickness, and therefore strength, of the lithosphere?

internal temperature

The terrestrial planet cores contain mostly metal because

metals sank to the center during a time when the interiors were molten throughout.

Which internal energy source produces heat by converting gravitational potential energy into thermal energy?

Accretion and Differentiation

Which of the following best describes convection?

It is the process in which warm material expands and rises while cool material contracts and falls.

What are the circumstances under which convection can occur in a substance?

when the substance is strongly heated from underneath.

The three principal sources of internal heat of terrestrial planets are

accretion, differetiation, and radioactivity.

The main process by which heat flows upward through the lithosphere is


Which of the following worlds have the thinnest lithospheres?

Earth and Venus

Which of the following best describes why the smaller terrestrial worlds have cooler interiors than the larger ones?

The have relatively more surface area compared to their volumes.

Which of the terrestrial worlds has the strongest magnetic field?


Why does Earth have the strongest magnetic field among the terrestrial worlds?

It is the only one that has both a partially molten metallic core and reasonably rapid rotation.

Which of the following most likely explains why Venus does not have a strong magnetic field?

Its rotation is too slow.

What are the conditions necessary for a terrestrial planet to have a strong magnetic field?

both a molten metallic core and reasonably fast rotation.

Which of the follwoing does not have a major effect in shaping planetary surfaces?


How large is an impact crater compared to the size of the impactor?

10 times larger

When we see a region of a planet that is not as heavily cratered as other regions, we conclude that

the surface in the region is younger than the surface in more heavily cratered regions.

What type of stresses broke Earth's lithosphere into plates?

the circulation of convection cells in the mantle, which draged against the lithosphere

Which of the following describes erosion?

the wearing down or building up of geological features by wind, water, ice and other phenomena of planetary weather.

Which of the following describes volcanism?

the eruption of motlen rock from a planet's interior to its surface.

Which of the following describes impact cratering?

the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface

What kind of surface features may result from tectonics?

Mountains, Cliffs, Valleys, Volcanos

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