During the Cenozoic era,mountain building in western North American was caused by tectonic activity.
~Hope this helps!
Answer:
A nation-state is a state where the vast majority of the population is comprised of a single ethnic group which also serves as a motivation and reason for the formation of the state.
Explanation:
A nation-state is a term used for the nations where the vast majority of the population is comprised of a single ethnic group, usually over 90%. There are multiple examples of such states around the world, some of which are fully recognized, while some function in practice as such but are not officially recognized by the United Nations. In the first category, we have the likes of Mongolia, Iceland, and numerous island nations in the Pacific, while in the second one we have the likes of Kosovo and South Ossetia.
These nations are often formed on the basis of the distribution of an ethnic group, thus determining the boundary in accordance with where the particular ethnic group is found without interruptions. An interesting case was the recent referendum for independence in Scotland as if it was successful it would have meant the creation of another nation-state. This was carefully monitored by many ethnic groups in the world because they saw it as an opportunity to create their own nation-states.
The Earth's gravity effects the erosion on it's surface with it's pulling force that pulls everything towards it's center, thus causing everything to fall and move from the higher parts towards the lower ones on the surface. When there's mass movement, the gravitation pulls it downwards, so huge amounts of ground, buildings, plants, animals, rocks fall and move to a certain lower place, thus stripping one place but filling another with lot of material of all sorts. The rivers always move downwards because of the gravitational pulling force, because of their movement they are able to pull lots of things with them, so everything they carry with them, they carry it in the lower parts and make depositions on the places were they are very slow or where they end. The glaciers are moving slow, Because of the gravitation that movement is downwards. Since they are very heavy and solid, they break the rocks with the pressure they cause on them, so they pull of that material to the lower places were they melt.
