Across
- 1. -the crust is broken into big pieces, like a gigantic jigsaw puzzle. These move slowly — at just 3 to 5 centimeters per year.
- 3. -this is Earth’s thickest layer. It starts a beneath the surface. Made mostly of iron, magnesium and silicon, it is dense, hot and semi-solid
- 6. - the rigid outer part of the earth, consisting of the crust and upper mantle.
- 8. - the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
- 10. - Earthquakes and other tectonic plate movement
Down
- 2. - the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
- 4. -like the shell of a hard-boiled egg. It is extremely thin, cold and brittle compared to what lies below it. The crust is made of relatively light elements, especially silica, aluminum and oxygen. It’s also highly variable in its thickness. Under the oceans (and Hawaiian Islands), it may be as little as 5 kilometers thick. Beneath the continents, the crust may be 30 to 70
- 5. eruptions - openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface.
- 7. -Extremely dense, it’s made mostly of iron and nickel.
- 9. -This part of the core is also made from iron and nickel, just in liquid form.