Give two reasons why the angle of the Sun’s rays affect the amount of heat absorbed by the Earth’s surface

Give two reasons why the angle of the Sun’s rays affect the amount of heat absorbed by the Earth’s surface. Feel free to draw a picture if that helps explain it. Remember on this question I am asking about the angle that the sun’s EM waves actually enter the atmosphere and hit the Earth’s surface.

You will show that you understand the topics by writing a short essay (about ½ to 1 page typed, single spaced)