Question

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. There is no single topic sentence. B. The author uses comparison and contrast to organize ideas. C. The topic sentence is the found in the last line. D. There are no supporting details for the main idea.

Answer 1

The correct option is A. 
The passage does not have any topic sentence. A topic sentence refers to the sentences which opens a paragraph and which expresses the main idea of the paragraph in which it occurs. The topic sentence is the focus sentence of a paragraph and it helps the writer to organize the paragraph by summarizing the information in the paragraph.