Which of the following correctly describes seafloor spreading?

a. new oceanic crust is formed at midocean ridges, pushed away from the ridge, and destroyed at deep-sea trenches.

b. new oceanic crust is formed at seamounts and spreads outward in all directions.

c. new oceanic crust is formed at deep-sea trenches, pushed away from the trench, and destroyed at midocean ridges.

d. new oceanic crust is formed in the middle of tectonic plates and then spreads outward in bands.

The answer is B. This occurs at mid-ocean ridges, where two tectonic plates are moving away from each other. As they move in opposite directions, the magma from the mantle below rises to fill the void/space left above. As the magma rises, it cools and forms a new crust. This volcanic activity continues as long as the tectonic plates are moving away from each other and new crust is formed spreading outwards from the ridge, with time.

answer: c

explanation:

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.