Agroup of scientists in alaska notices that not only have atmospheric co2 levels increased at their sampling site but so too have methane levels. what most likely accounts for this increase in methane levels? none of the answer options is correct. the melting of permafrost accompanied by the thawing of methane-producing bacteria. a decrease in beef production near the researchers' sampling area. the failure of rice paddies to be established in alaska, given its climate. the release of methane from thawed permafrost.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.