We are confident that rising CO2 levels are caused by the burning of fossil fuels because atmospheric CO2 now has the same carbon isotope ratio as fossil fuels
Indicate whether the statement is true or false
TRUE
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Susan Solomon led the scientific expedition that
A) measured the rate of temperature increase at isolated places on earth, such as the north pole and the Gobi desert. B) studied the problem of ozone depletion over Antarctica. C) measured the carbon-dioxide content of the atmosphere at many places on Earth. D) measured the ozone content of the upper atmosphere at many places above the surface of the earth. E) studied in detail the atmospheric effects (especially carbon-dioxide injections) of large active volcanoes.
What spectral class of star fits between a type G and a type M?
a. L b. K c. A d. F
Why are relatively few details known about the life that existed on Earth prior to a few hundred million years ago?
A) Nearly all life at that time was microscopic, making it much more difficult to identify. B) Older rocks are rarer than younger rocks because of geologic processes. C) Many rocks have been transformed by high heat and pressure, destroying any fossils they contained. D) All of the above are correct.
How was the surface of Venus mapped?
a) with images taken in optical light by the Keck Telescope inHawaii b) with a roving vehicle that landed on the surface of Venus c) with images taken in optical light by the Hubble Space Telescope d) with radar bounced off of it by the Magellan spacecraft e) it is impossible to map the surface of Venus by any method because it has no surface