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