1. the earth spining on its axis.
a.92.96 million mi
b.<span>When the sun's rays strike Earth's surface near the equator, the incoming solar radiation is more direct (nearly perpendicular or closer to a 90˚ angle). Therefore, the solar radiation is concentrated over a smaller surface area, causing warmer temperatures.
c.</span><span>The moon's gravitational pull on the Earth is the main cause of the rise and fall of ocean tides. The moon's gravitational pull causes two bulges of water on the Earth's oceans—one where ocean waters face the moon and the pull is strongest and one where ocean waters face away from the moon and the pull is weakest.
d. </span><span>about 1,000 miles per hour (1,600kph)</span>
A pure<span> substance is something that occurs in nature. An element is made up of one type of atom only and cannot be split further. A </span>compound<span> has the </span>combined <span>properties of the elements from which it is made. Atoms show the macro properties of an element. </span>
While an electromagnetic wave<span> is called just a disturbance, a </span>mechanical wave<span> is considered a periodic disturbance. </span>Mechanical waves<span> are also called elastic </span>waves<span>as their propagation depends on the elastic properties of the medium through which the </span>waves<span> pass.</span>
The answer is "the moon."
