The gases that make up 99% of Earth's atmosphere are

A. nitrogen and carbon dioxide.
B. oxygen and carbon dioxide.
C. oxygen and hydrogen.
D. oxygen and nitrogen.


Answer: D

Environmental & Atmospheric Sciences

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Which statement best describes the relationship between remote sensing and GIS?

A) A GIS is used to create remotely sensed images. B) Remotely sensed images can be used in a GIS. C) Remote sensing is another term for GIS. D) There is no relationship. E) The letters in GIS stand for "remote sensing" in French.

Environmental & Atmospheric Sciences

In 2014 the population of Earth is estimated to be about 7.2 billion

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

A scientist identifies a rock sample as andesite. Why did he do so?

A) He observed that the rock has a lot of silica, making it mafic. B) He observed that the rock has a lot of silica, making it ultra-mafic. C) He observed that the rock has a decent amount of silica, making it intermediate. D) He observed that the sample has little silica, making it felsic.

Environmental & Atmospheric Sciences

If the mineral assemblage in metamorphic rocks is the same, they are regarded as having formed under similar pressure and temperature conditions and belong to the same ________.

A. metamorphic facies B. metamorphic temperature/pressure suite C. metamorphic mineral group D. metamorphic rock group E. metamorphic province

Environmental & Atmospheric Sciences