Scientists have different methods to help clean up oil spills in the ocean, including strong chemicals and the use of bacteria. what is the advantage of using bacteria instead of chemicals???

Bacteria would also be better for the sea creatures. Chemicals may harm them.

Explanation:

Scientists had observed that marine bacteria were very efficient at removing oil from seawater. Altogether, the results suggest that some bacteria can not only tolerate but also break up oil, thereby helping in the cleanup process.

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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.

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