0
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.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoBecause the earth has plate's that move. not plates that you eat with. scientist learned that plates ,rather than continents, actually move. Plate movement is caused by continental drift, or the transfer of oceanic crust.
Add your answer:
Earn +20 pts
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
Where are 90 percent of earth's volcanoes located why do we find volcanoes there?
I can answer the first part 90 percent of earth's volcanoes are found at plate boundaries.
Why is magma the described as the lifeblood of earth volcanoes?
Magma is described as the lifeblood of earth's volcanoes, because it is red in colour and without it there would be no volcanoes.
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.
How many volcanoes are there are earth?
there are approx. 1500 active volcanoes on earth
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.
Why do you have volcanoes?
Well, if volcanoes didn't exist, neither would the earth. Since volcanoes helped build the earth.
Why is there so little evidence of the period if heavy bombardment on earth?
Earths volcanoes;)
Does earth have volcanoes craters rings valleys?
Earth has volcanoes, craters, and valleys but not rings.
Why do people have volcanoes?
They don't the earth makes volcanoes
Which is powered by energy from earth interior?
volcanoes
Is mars the only planet with volcano?
No. Earth (obviously) and Venus have volcanoes as well.
