what is the theory that explains why and how continents move?
100
Is an opening, or rupture, in a planet's surface or crust, which allows hot magma, volcanic ash and gases to escape from the magma chamber below the surface.
And it forms subduction
What is a volcano and How does it form ?
100
A strands of volcanoes around the Pacific Ocean.
What is the Ring of Fire ?
100
By studying data from earthquakes.
What is a way for scientists to ientify Plate boundaries ?
100
To be driven by a combination of the motion of the seafloor away from the spreading ridge
What is Plate Movements ?
200
the movement of the Earth's continents relative to each other by appearing to drift across the ocean bed.
What causes Continental Drift ?
200
Earthquakes are caused when tension is released from the rocks in the Earth's crust and upper mantle
what causes earthquakes ?
200
A fixed source of abundent rising magma that forms a volcanic center that has persisted for tens of million of years.
What is a Hot spot ?
200
it rises to the surface and cools to form new ocean lithosphere
What happens to magma at divergent boundaries?
200
The upper mantle
Where specifically does mantle convection take place?
300
Boundary at which two plates slide past each other horizontally
What causes earthquakes at transform boundaries?
300
Warm, light and sits higher than the surroundings sea floor because it is less dense
Describe the rock that forms when magma cools to form new oceanic lithosphere
300
90%
What percent of the worlds volcanoes are on the ring of fire?
300
Ocean floor
Where are most divergent boundaries located?
300
Continental Drift
What is Alfred Wegners theory?
400
The mantle
What do plates float on?
400
they usually form on the edges of tectonic plates
can volcanoes form any where on earth?
400
along pacific ocean
Where is the ring of fire located?
400
It subducts.
What happens when two plates made of continental lithosphere collide?
400
Hot material in the mantle sinks
What causes tectonic plate movement?
500
Lauraia and Gondwana
What were the two huge continents formed 180 million years ago?
500
volcanoes and earthquakes concentrated along the edges of some continents
What is the pattern of volcanoes and earthquakes?
500
It was discovered in 1949.
when was ring of fire discovered?
500
They dont't produce magma
How are transform boundaries different from other types of boundaries?
500
Pangaea
What is the name of the supercontinent that existed about 200 million through 100 million years ago?