2007-03-31 13:10:57 · 4 answers · asked by juliussapiandante 2 in Science & Mathematics ➔ Earth Sciences & Geology
Geologically speaking a shield is a segment of continental area which has tectonically stabilized since Precambrian and is not part of mobile mountain systems or where mountain building processes have ceased. It means it would expose mainly Precambrian and older rocks and would be seismically inactive or quite, unlike mobile belts which are seismically very active and where mountain building processes are still active. However, in some shield areas minor seismic events have been reported and a question is raised now whether in reality the shield areas are seismically inactive
2007-03-31 14:24:42 · answer #1 · answered by mandira_nk 4 · 1⤊ 0⤋
A shield is the tectonically inactive (for a long geologic time) center of a craton.
2007-03-31 20:49:04 · answer #2 · answered by Amphibolite 7 · 2⤊ 0⤋
a shield is an exposed area of very old rocks at the center of a craton. a craton is the stable part of a continent that has survived the seperation and collision of continents for at least 500 million years.
2007-03-31 21:46:55 · answer #3 · answered by 22 4 · 0⤊ 0⤋
What the guy above me said, but to be more clear, craton is the center of a continent. It means that the land in the center of the continent is older than the edges (coast).
2007-03-31 20:59:21 · answer #4 · answered by Kelly M 4 · 1⤊ 0⤋