During explosive volcanic eruptions, large amounts of ash entering Earth's atmosphere often
trise to an altitude of 20 kilometers. What is the most likely effect of this ash cloud?
a decrease in the insolation reaching Earth's surface
a decrease in the thickness of Earth's stratosphere layer
an increase in the insolation reaching Earth's surface
an increase in the thickness of the Earth's stratosphere layer

Decrease in the thickness of Earth's stratosphere layer

Explanation:

This reduces the ozone-layer effectiveness thereby making the harshness of the sun more fierce on men.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.

heat released by collision processes during accretion, and heat from decay of radioactive elements

explanation: