Which of these is NOT a variable gas in Earth’s atmosphere?

A. carbon dioxide
B. ozone
C. methane
D. water vapor
E. oxygen


E

Environmental & Atmospheric Sciences

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Which of the following minerals is a silicate (a mineral containing a silicon-bearing ion)?

A) hematite B) feldspar C) calcite D) halite

Environmental & Atmospheric Sciences

The seasons are primarily due to

A. the distance of Earth from the Sun. B. the tilt of Earth's axis. C. variations in greenhouse gas levels. D. the wavelength of solar radiation.

Environmental & Atmospheric Sciences

According to the rock cycle, a sedimentary rock can be formed from a(n)____

a. igneous rock only b. sedimentary rock only c. metamorphic rock only d. igneous or metamorphic rock e. igneous, sedimentary, or metamorphic rock

Environmental & Atmospheric Sciences

What ethnic group in China practices Islam and has faced opposition from the government?

A) Naxi B) Uyghur C) Hui D) Miao E) Zhuang

Environmental & Atmospheric Sciences