Oceanic Crust vs. Continental Crust
Geophysicist and geologist Tanya Atwater discusses the differences between continental and oceanic crust. Continental crust tends to be much thicker
Subject: crust
Transcript: Ocean crust is essentially made by sea-floor spreading. When you pull it open, some of the lava comes to the top And freezes and makes that crust
Over the Edge: Oceanic Ridge System, The
Perhaps the most striking feature that characterizes the deep ocean floor is the vast oceanic ridge system that encircles the Earth along tectonic plate boundaries.
Subject: crust
Transcript: tectonic plate boundaries. [johnson:] a mid-ocean ridge is the place Where ocean crust is formed. If you can imagine two rigid blocks, like north america And
World in Motion: Earth's Tectonic Past and Future
Scientists attempt to reconstruct Earth's history so as to better understand the current state of geologic affairs, including those forces that cause plate movement.
Subject: crust
Transcript: that spot. But there are other places on earth where instead Of seeing a chain of islands or a chain of events, The same feature stays with the crust
World in Motion: Understanding Earth's Interior
Many scientists believe the plate tectonics process begins deep within the Earth. The challenge is to gather reliable data about an area that no one has ever actually explored--at least not directly.
Subject: crust
Transcript: the crust, the mantle and the core. The crust is very thin. It's about up to 10 kilometers thick in the oceans, maybe, Typically, 30 or 40 in the