The Earliest Known Life Forms Existed on Earth

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,

Q12: At its center, Earth's temperature is about

Q13: Below a thin layer of soil and

Q15: Oceans cover about 71 percent of the

Q16: A giant meteorite smashing into Earth is

Q17: A _ is a combination of interacting

Q18: Which of the following is not a

Q19: Oceans contain _ percent of the Earth's