Zenith 0
ALT =
• Fill in the missing values.
The sky above
STAR
IN THE
SKY +
meridian
+
+
You stand on
ALTITUDE
top of the Earth.
+
+
AZI =
O
AZIMUTH
EAST
AZI =
SOUTH
NORTH
WEST
horizon
EARTH
horizon
ALT =
0

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.