What is the relationship between convection currents, seafloor spreading, and the formation of ocean basins?

Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.

There is a direct relationship between the convection current, spreading of the seafloor and ocean basin formation.

During the time of divergent plate motion, two plates move in the opposite direction due to the convection current generating in the mantle layer, which forces the plates to move in the opposite way. This results in the formation of cracks on the seafloor, and with progressive motion, the seafloor spreading takes place, thereby forms a narrow type of valley, erupting the magma along with water. This, over some millions of years, turns into an ocean basin.

Thus, they are directly related to one another and are some of the major processes of plate tectonics.

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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