1. This question is based on the following paragraph. The sentences are numbered to help you answer the question.
(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?
A. The topic sentence is the found in the last line
B. There is no single topic sentence.
C. The author uses comparison and contrast to organize ideas.
D. There are no supporting details for the main idea.