Fault is:

Fault is:

• A. A volcanic crater
• B. A mineral seam
• C. A crack in the earth's crust due to rock cooling
• D. A crack in the earth's crust resulting from the displacement of one side with respect to the other

Answer: (D)

A fault is a crack in the Earth's crust along which rocks on opposite sides have moved past each other under tectonic forces. The key idea is the movement: one side shifts relative to the other. That’s why this option is the best fit, since it explicitly describes displacement between the two sides. The other ideas don’t fit because they describe different features: a volcanic crater is formed by eruption, not by rocks sliding past each other; a mineral seam is a layer of minerals within rock, not a break with movement; and a crack from cooling is a joint or fracture without the rocks shifting along the crack.

A fault is a crack in the Earth's crust along which rocks on opposite sides have moved past each other under tectonic forces. The key idea is the movement: one side shifts relative to the other. That’s why this option is the best fit, since it explicitly describes displacement between the two sides.

The other ideas don’t fit because they describe different features: a volcanic crater is formed by eruption, not by rocks sliding past each other; a mineral seam is a layer of minerals within rock, not a break with movement; and a crack from cooling is a joint or fracture without the rocks shifting along the crack.