The Hydrosphere Includes Water in Streams, Lakes, and Oceans; in the Atmosphere;

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)

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

Q13: Below a thin layer of soil and

Q14: The earliest known life forms existed on

Q15: Oceans cover about 71 percent of the

Q16: A giant meteorite smashing into Earth is