Which steps are part of the seafloor spreading process ? check all that apply !

The correct answers are:

- New oceanic crust is created;

- Volcanoes erupt and produce more crust;

- Old crust is pushed away from ocean ridges;

When we have a divergent plate boundary, the plates move away from one another. As they move away, they leave a gap behind them, and lot of cracks in the thinner crust left behind. The high pressures from the mantle manage to push upwards the magma very easily through that crust and cracks. As the magma reaches the surface, it creates underwater volcanic activity. The magma comes out on the seafloor and quickly cools off. As it cools off, it creates new oceanic crust, thus the oceanic ridges. Because of the movement of the plates, and the constant new creation of new crust, the old crust is pushed away from the oceanic ridges.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

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