Across
- 3. a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
- 5. a type of excavation or depression in the ground that is generally deeper than it is wide.
- 7. the relatively thin part of the earth's crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.
- 9. a fracture or zone of fractures between two blocks of rock.
Down
- 1. a scientific theory that explains how major landforms are created as a result of Earth's subterranean movements.
- 2. the molten or semi-molten natural material from which all igneous rocks are formed.
- 4. the outermost layer of Earth's lithosphere that makes up the planet's continents and continental shelves and is formed near subduction zones at plate boundaries.
- 6. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
- 8. an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock.