Answer:
well
Explanation:
The Grand Canyon contains some of the oldest exposed rock on Earth. The mile-high walls reveal a cross section of Earth's crust going back nearly two billion years. These rock layers have given geologists the opportunity to study evolution through time
you can search the internet about it
A deep water wave is a wave way under water. A shallow water wave is a normal wave that you see on top of the water.
We can not say that this areas are not civilized or to call them backwards. We may call them different. We can take for example the uses of animals in order to expand the commerce of their area. If we research about the use of camels, for example, we could see that it gained an special place within those who wanted to travel through many difficult areas like deserts. So in the case of camels they were not backwards, they used a different method to obtain success
The jet stream has high altitude rivers of air.
