__________ Is a Principle That States That Occasional Huge Catastrophes

Q1: The _ contains all of Earth's water.

Q3: Liquid freshwater amounts to about _ percent

Q4: The Earth's core is composed of hot,

Q5: The atmosphere consists mainly of _.<br>A) nitrogen

Q6: The increased carbon dioxide level has raised

Q7: Homo sapiens and our direct ancestors have

Q8: The Earth's core is part of the

Q9: Water frozen in glaciers is part of

Q10: Oceans:<br>A) cover 7 percent of the Earth.<br>B)

Q11: The hydrosphere includes water in streams, lakes,