| Lithosphere: Rigid, rocky outer layer of the Earth, consisting of the crust and the solid outermost layer of the upper mantle. It extends to a depth of about 60 mi (100 km).
http://www.britannica.com/EBchecked/topic/343783/lithosphere
The lithosphere moves at about the rate your fingernails grow. The lithosphere moves on a layer of the mantle called the asthenosphere. Convection currents within the asthenosphere cause the plates to move. Define asthenosphere and convection current.
Asthenosphere: zone of Earth’s mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere is thought to extend from about 60 miles (100 km) to about 450 miles (700 km) below Earth’s surface.
http://www.britannica.com/EBchecked/topic/39770/asthenosphere
A tectonic plate boundary is where two tectonic plates meet. Explain how we determine where tectonic plate boundaries are?
Frequent earthquakes occur at all plate boundaries.
http://www2.sunysuffolk.edu/hornj/ESC102_PlatesAssgnmt_Fig1.jpg
Share with your friends: |
