If a solution is oversaturated, will osmosis continue to happen like normal and will the unsaturated solute become saturated as more solvent is added?

Yes.

Explanation:

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If there are two solutions of different concentrations separated by a semipermeable membrane, the solvent (water) passes from the less saturated compartment to the more saturated compartment due to the natural tendency that exists to match concentrations. In other words, the water will diffuse until the hydrostatic pressure equals the osmotic pressure.

So the solvent will diffuse from the unsaturated solution towards the oversaturated one.

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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.