Question

(1) Earths 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 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 sentence in this passage introduces a new topic that might begin a new paragraph?
A. Sentence 4
B. Sentence 6
C. Sentence 5
D. Sentence 7

Answer 1

The answer is D because you are starting a new thought about what tectonic plates can do.

Answer 2

The answer is D. Sentence 7. When it says "plates may also collide", it is bringing up another topic about the plates. As you read past sentence 7, you notice a shift in topic as you are reading. Instead of plates sliding against each other, the speaker is now talking about them colliding.