Passage A

Avalanches are caused by a variety of conditions. When the temperature is cold and snow falls, the snowsticks to the ground. However, when the air temperature changes, the snow may slide away in pieces or slabs. Basically an avalanch happens when the gravity of snow heading downhill is greater than the gravity holds the snow together on the ground. Steep slopes on mountains, a recent heavy snowfall, a weak layer in the snow cover, changes in the weather, and changes in pressure on the suface (such as a skiers's sudden weight) can all contribute to the creation of an avalanch.
Passage B
Avalanches, happen in a series of stages. First, while the temperature is cold and there is a heavy snowfall, the snow will stick to the ground. Suppose that what happens next is that the air temperature changes after the snow has fallen. Then, a layer of snow may weaken. Next, suppose that a skier lands on the weakend snow. The snow may then slide away from the ground in pieces or slaps. As the slaps head downhill, their gravity is greater than the snow underneath. They may slide down a steep slope, creating a major avalanche.
What is the author's purpose in Pasage B?
A. To compare the elements leading up to an avalanche
B. To describe how skiers contribute to an avalanche
C. To show the many dangers of an avalanche.
D. To explain the process of an avalanche
Is the answer D?
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Yes, the answer is D. The author's purpose in Passage B is to explain the process of an avalanche. The passage provides a step-by-step description of the stages that occur leading up to an avalanche, including the conditions, the weakening of the snow layer, and the sliding of the snow.