L1 Flashcards Preview

GCSE 5GB1 - Biosphere 2015-16 > L1 > Flashcards

Flashcards in L1 Deck (9)
Loading flashcards...
1
Q

What’s is the structure of the earth

A

outer core, mantle and crust. The crust is made up of tectonic plates, which are in constant motion.

2
Q

What is the crust made up of

A

The crust is made up of tectonic plates.

3
Q

How do plates move

A

The plates move because of convection currents in the Earth’s mantle. These are driven by the heat produced by the decay of radioactive elements and heat left over from the formation of the Earth.

4
Q

Where are volcanoes most likely to occur

A

Earthquakes and volcanoes are most likely to occur at plate boundaries.

5
Q

What are the two types of crust

A

▪ Continental – old, denser

▪ Oceanic – younger, less dense

6
Q

2 parts of mantle

A

Upper part is solid – like the crust; together called the lithosphere
Asthenosphere- sticky, viscous,hotter than upper

7
Q

Describe th asthenosphere

A

Rock become Heated, rises, spreads, cools, sinks back to the bottom, reheats and rise again

8
Q

What is th core made or

A

Iron and nickel

9
Q

Composition and purpose of magnetosphere

A
Outer core – liquid iron
o Works like an electric dynamic
o Producees a magnetic field
o Its invitislbe
o Protects thre Earth from hamrlful radioactiom from space