(1) Earth's crust is made up of relatively rigid plates that ride atop Earth's hot, semiliquid mantle. (2) The

plates are called tectonic because they're in constant motion. (3) They can move because Earth's mantle is

a very hot and semiliquid fluid called magma. (4) Volcanoes are a result of magma rising up or erupting

through a plate, particularly where plate boundaries are moving against each other. (5) Also, when plates

slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6)

Therefore, we often find volcanoes and earthquakes along plate boundaries. (7) Plates may also collide. (8)

When that happens, mountain ranges are formed. (9) For example, the collision of the plate carrying the

Indian subcontinent created the Himalayan Mountains when it collided with the Asian plate.

Which statement about this paragraph is accurate?

AThe topic sentence is the found in the last line.

BThe author uses comparison and contrast to organize ideas.

CThere are no supporting details for the main idea.

DThere is no single topic sentence.