A3
Lesson Summary
Vocabulary Link
- oceanic crust
- continental crust
- topographic feature
- continental margin
- continental shelf
- continental slope
- continental rise
- deep-ocean basins
- oceanic ridges
- ocean trench
- abyssal plains
- The two types of crust are distinguished based on differences in chemical composition and density.
- Oceanic crust is primarily basalt, and has a density of 3.0 g/cm3.
- Continental crust has a high proportion of granite, and has a density of 2.7 g/cm3.
- Continents have two major distinguishing features: mountain belts and stable interiors.
- The continental margins include the continental shelves, the continental slopes, and the continental rises.
- Deep-ocean basins include oceanic ridges, ocean trenches, and abyssal plains.