The Earth's population (in mid-2009) was about __________ people.
A) 2.3 billion
B) 4.5 billion
C) 6.7 billion
D) 8.2 billion
Correct Answer:
Verified
Q26: Water frozen in glaciers is a component
Q27: A _ is a combination of interacting
Q28: The Earth's mantle is found in the:
A)
Q29: The core is:
A) the least dense layer
Q30: Oceans:
A) cover 7 percent of the Earth.
B)
Q32: Earth's surface systems are ultimately powered by
Q33: Homo sapiens and our direct ancestors have
Q34: Our Solar System formed:
A) when a fiery
Q35: Geologists estimate that Earth formed _ years
Q36: A tectonic plate is composed of:
A) cool,
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