How does the age of the seafloor sediments change with increasing distance from the ocean ridge

The main source of downwarnd convective flow in the mantle is called

The downward sliding characteristic of ridge push is the result of

The thermal convection that drives plate motion is caused by

According to whole mantle convection

A magmas viscosity is directly related to its

Which of the following factors help determin whether a volcanic eruption will be violent of relatively quiet

As the temperature of lava increases

Highly explosive volcanoes tend to have what type of magma?

A volcanic bomb is a

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