1. What was the time of the greatest population growth in the world? A.) the late nineteenth century
B.) the mid-seventeenth century
C.) the early twenty-first century
D.) the mid-twentieth century

2. Petroleum, natural gas, and coal are three main types of which of the following? (1 point)

A.) fossil fuels
B.) nuclear energy
C.) solar energy
D.) hydroelectric power

3. Which type of energy is generated from natural resources such as sunlight, rain, and wind?

A.) renewable energy
B.) non-renewable energy
C.) nuclear energy
D.) geothermal energy

4. Which of the following is true about Ice Ages?

A.) They are caused by man-made activities.
B.) They are in a feature of Earth's natural weather patterns.
C.) They make Earth's overall temperature drop hundreds of degrees.
D.) They occur every five years. ​