Sec 3-6 Vocab Review

5. a long, narrow belt in which one plate moves downward into the mantle beneath the edge of another plate at a convergent plate boundary.
7. a kind of volcanic igneous rock, usually dark colored, with a high content of iron.
10. the record of the past orientation and polarity of Earth’s magnetic field recorded in rocks containing the mineral magnetite.
11. Earth’s most recent supercontinent, which was rifted apart about 200 million years ago.
12. a long, narrow, elongated depression of the deep seafloor.
13. zone the zone on Earth’s surface where two continents have collided and have been welded together to form a single continent.
15. a long crack in a lithospheric plate formed by hot mantle pushing up from below.
16. a region where two (or more) lithospheric plates move toward one another and collide.
17. the process of one lithospheric plate moving beneath another.
18. rock formed by volcanic activity.

1. a large mass of igneous rock formed when magma intrudes and solidifies.
2. accretion the growth of a continent along its edges.
3. any evidence of past life preserved in sediments or rocks. fold: a bend in a planar feature of rock.
4. a very hot spring on the ocean floor where heated, mineral-rich water exits from cracks in Earth’s crust.
6. a region where lithospheric plates are moving horizontally in relation to one another.
8. a large continent consisting of all of Earth’s continental lithosphere. Supercontinents are assembled by plate tectonic processes of subduction and continent-continent collision.
9. a region where lithospheric plates are moving away from each other.
14. a large, long valley on a continent, formed where the continent is pulled apart by forces produced when mantle material rises up beneath the continent.