Question 15 of 15If scientists were to watch a planet for millions of years and see no movement on the crust, it might indicate that the planet has no:A.atmosphere above its crust.B.life in its polar and subpolar regions.C.convection below the crust.D.mountains, valleys, or meteor craters.SUBMITarrow_backPREVIOUS
Question
Question 15 of 15If scientists were to watch a planet for millions of years and see no movement on the crust, it might indicate that the planet has no:A.atmosphere above its crust.B.life in its polar and subpolar regions.C.convection below the crust.D.mountains, valleys, or meteor craters.SUBMITarrow_backPREVIOUS
Solution
The answer is C. Convection below the crust.
Here's why:
A. Atmosphere above its crust - The presence or absence of an atmosphere doesn't directly affect the movement of a planet's crust.
B. Life in its polar and subpolar regions - Life, especially microbial, can exist in extreme conditions, but it doesn't cause or prevent crustal movement.
C. Convection below the crust - This is the correct answer. Convection currents in the mantle (the layer below the crust) are a major driver of plate tectonics, which causes the crust to move. If there's no convection, it would suggest there's no movement in the crust.
D. Mountains, valleys, or meteor craters - These are features on the surface of the crust and their presence or absence doesn't indicate whether or not the crust is moving.
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