Renewable energy comes from a source that is not reduced when it is used. The sun, for example, continues to have the same amount of energy whether that energy is turned into electrical energy or not. In contrast, the supply of coal decreases when it is turned into electrical energy. The primary types of renewable energy in the United States are solar, wind, biomass, hydropower, and geothermal. The amount of energy supplied by each type of renewable energy from 2006 to 2016 is summarized in Figure 1, which also includes supply projections for 2017 and 2018. (Figure 1) During which time interval did hydropower energy production increase? Question 4 options: 2009-2010 2010-2011 2011-2012 2012-2013

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8