Question

1. the asthenospheres convection cycles contribute to:

a the earths tidal forces
b creation of continental crust
c the regulation of earths day - night cycle
d the forming of climates and weather patterns

Explanation:

To solve this, we analyze each option:

• Option A: Tidal forces are due to gravitational interactions (e.g., Moon, Sun), not asthenosphere convection. Eliminate A.
• Option B: The asthenosphere (part of the mantle) has convection currents that drive plate tectonics, which can lead to the creation of continental crust (e.g., through processes like orogeny, magmatic activity at plate boundaries). This is consistent with geologic processes related to mantle convection.
• Option C: Earth’s day - night cycle is caused by Earth’s rotation on its axis, not asthenosphere convection. Eliminate C.
• Option D: Climates and weather patterns are driven by solar energy, atmospheric circulation, ocean currents, etc., not asthenosphere convection. Eliminate D.

Answer:

B. creation of continental crust