The Sun’s energy reaches Earth as and energy

solar radiation

Explanation:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.

The main cause of the Indian Wars of this period was the notion of Manifest Destiny. For decades, Americans from the east were pushing west in an effort to gain control of more land and resources. Many felt that it was their God-given right to control the continent from sea to sea. This was accelerated by the expansion of the railroad during the latter half of the nineteenth century. Sometimes valuable resources such as gold and other precious metals were discovered on native land. This encouraged more settlers and led to inevitable conflict. Land was also desired for the purposes of ranching and farming.

Explanation:

This meant that the the relations between Americans, and natives would be in a enemy context.

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