B, government is the answer
Formation of Earth and our Solar system
Answer:
Each layer in the Earth's crust changes in fundamental ways the closer it is to the planet's core. There are four layers of the Earth, and each layer has a different density, composition, and thickness. Three hundred years ago, English scientist Isaac Newton created the foundation for current scientific thought about the density of the Earth’s layers.
Features that are typical for the divergent plate boundaries are:
- <em>ocean ridges;</em>
Underwater mountain chains that are very long and are marking the border of the plates.
- <em>formation of new crust;</em>
Since the crust is very weakened and loose, the high temperature, pressure, and magma, are able to penetrate it and create new crust.
- <em>intense volcanic activity;</em>
The high amount of magma penetrating from the mantle layer is causing intense volcanic activity, thus the creating on new crust, and underwater mountain chains.
Letter A. The statement that best describes 21st-century migration flow to the United States is that l<span>arge numbers of immigrants and migrant workers, including skilled and unskilled laborers and many with advanced degrees, are coming to the United States from South and Central America.</span>
