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Although the crust of the planet Earth is relatively cool (much cooler than the melting point of rock) the interior is hot, and contains a layer of liquid rock, also known as magma (over a deeper layer of liquid metal). The heat is the result of radioactive elements inside the Earth. Since the termperature is not perfectly uniform, there are convection currents within the magma, and an upward current can cause magma to break through the surface, forming a volcano.
What else can I help you with?
Is it true volcanoes are caused by boiling rock from the centre of the earth?
Pretty much so.
Are volcanoes made of rock?
A volcano is a part of the earth where there is so much heat underground that the rocks actually melt and are forced to the surface. Volcanoes are formed of the rock that solidifies as that molten rock cools down and hardens.
Do volcanoes only erupt on earth?
No, Astronomers have discovered erupting volcanoes on Venus as well as Earth
How many active volcanoes in the earth?
There are approximately 1,500 active volcanoes on Earth. These volcanoes have erupted at least once in the last 10,000 years.
Why are volcanoes prevalent in certain parts of earth?
Volcanoes occur along the plates of the Earth. Volcanoes can remain dormant, active, or in inactive states. Active volcanoes occur in particular regions of the world due to the movement of the plates in the Earth.
Is it true volcanoes are caused by boiling rock from the centre of the earth?
Pretty much so.
Why are the largest volcanoes on earth so much smaller than the largest ones on earth?
Scientists think this is probably due to larger eruption rates and to lower gravity on Mars than on Earth.
What did volcanoes have to do with the formation of the early atmosphere on earth?
earth's plates formed them and without them we would not have much land .
How much of the earth originated from volcanoes?
more than 80 percent of the earth's surface is volcanic in origin.
Are volcanoes made of rock?
A volcano is a part of the earth where there is so much heat underground that the rocks actually melt and are forced to the surface. Volcanoes are formed of the rock that solidifies as that molten rock cools down and hardens.
How many volcanoes are there are earth?
there are approx. 1500 active volcanoes on earth
Why is there so little evidence of the period if heavy bombardment on earth?
Earths volcanoes;)
What was the name of the first volcano explosion?
Volcanoes have been erupting on the Earth for so long, so no one on Earth at this very moment knows.
Why do you have volcanoes?
Well, if volcanoes didn't exist, neither would the earth. Since volcanoes helped build the earth.
Does earth have volcanoes craters rings valleys?
Earth has volcanoes, craters, and valleys but not rings.
Is mars the only planet with volcano?
No. Earth (obviously) and Venus have volcanoes as well.
Why do people have volcanoes?
They don't the earth makes volcanoes
