Earth Structure

4. The crust and the upper layer of the mantle together make up a zone of rigid,brittle rock called?
7. Which one of the earth layers that mostly consists of iron and nickel?
8. ___ mantle has a temperature in a range of 1,400°C – 3,000°C
9. Which part of earth's mantle with the thickness of only 100 km?
11. The thinnest earth layer
15. Inner core radiates its heat by?
16. mostly of oxygen and ____.
18. Term used when all the continents were joined to be one giant continent.
19. made
20. ____ in the outer core generates the magnetic field.

1. The middle layer of earth's interior layer.
2. The theory of plate tectonics was proposed at the beginning of the last century by a German scientist named _____
3. ___ layers differ in chemical composition.
5. Tectonic plates move because of convection currents in the Earth’s mantle. These are driven by the ____ produced by the decay of radioactive elements inside the Earth.
6. The continental crust is broken into pieces called ____ plates.
10. ____ rocks are made when molten rock cools down and solidifies.
12. Texture of earth's inner core.
13. ____ occur when molten rock pushes up through weaknesses in the crust.
14. ____ layers differ in their strength or rigidity. These layers do not correspond on a one-to-one basis with the compositional layers.
17. Type of earth's crust that underlies the ocean basins.