首页 > Term: placa continental
placa continental
A rigid, primarily granitic slab floating on the asthenosphere, a layer of semi-molten upper mantle. The plates average 125 kilometers of thickness and are pushed rather than pulled by currents in the mantle. (See Plate Tectonics. ) The continents riding atop the plates occupy 29% of the planet surface.
- 词性: noun
- 行业/领域: 生物学
- 类别 生态学
- Company: Terrapsych.com
0
创建者
- linaza
- 100% positive feedback
(Valladolid, Mexico)