The earth's crust is very important to human beings not only because they live in it but because of the socio-economic benefits it offers them. ... Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic crust. Both the continental and oceanic crust mantle.
Some reasons are business travel, family matters, reunions, parties :)
Farmers underwatering crops
Dinosaurs. I do not know the specific one, but the animals that dominated the Mesozoic era was dinosaurs.
