20 points plz !

at which point will a cloud form?

a. when the water vapor forms ice crystals.

b. when air reaches 10,000 ft.

c. when the temperature of the rising air rises above the dew point.

d. when the temperature of the rising air falls below the dew point.

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?