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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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

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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

The world's population had reached 2.0 billion by about the year:

A) 1850 B) 1930 C) 1990 D) 2010

Environmental & Atmospheric Sciences

During times of drought, the water table ____________________. Fill in the blank(s) with the appropriate word(s)

Environmental & Atmospheric Sciences