They grow distinct crystal shapes because they have a loot of room and their growth and movement is not restricted, which enables them to form in whichever way they can, which is why they are so distinct.
Plant life is influenced by the amount of rainfall. <u>Tropical rainforests extend to the north and south of the equator</u>. In some areas, like the Sahel zone, there are large differences in rainfall every year. In the last decades droughts have caused hunger and starvation in many part of the Sahel and Ethiopia.
