By 2.7 billion years ago, rocks formed that contained _________ indicating that well before that life existed that could _________.
Fill in the blank(s) with the appropriate word(s).
Ans: iron oxide, photosynthesize
Environmental & Atmospheric Sciences
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There is more energy stored in the oceans than in all the oil in the Middle East. Why don't we exploit the oceans as an energy source?
A. The energy in the ocean is low-quality. B. The oceans are too big to be exploited. C. The ocean is too cold. D. The ocean is too hot.
Environmental & Atmospheric Sciences
During times of drought, the water table ____________________. Fill in the blank(s) with the appropriate word(s)
Environmental & Atmospheric Sciences
Which type of convergent plate boundary results in a chain of submarine volcanoes?
A) oceanic-oceanic B) continental-continental C) continental-oceanic D) ridge-hot spot
Environmental & Atmospheric Sciences
The world's population had reached 2.0 billion by about the year:
A) 1850 B) 1930 C) 1990 D) 2010
Environmental & Atmospheric Sciences