II. Define the following:
1. Epeirogenic movements
4. Normal fault
2. Orogenic movements
5. Rift valley
3. Intermontane plateaus
6. Horst
Answers
Answer:
1)In geology, epeirogenic movement (from Greek epeiros, land, and genesis, birth) is upheavals or depressions of land exhibiting long wavelengths and little folding apart from broad undulations. The broad central parts of continents are called cratons, and are subject to epeirogeny
4)Normal, or Dip-slip, faults are inclined fractures where the blocks have mostly shifted vertically. If the rock mass above an inclined fault moves down, the fault is termed normal, whereas if the rock above the fault moves up, the fault is termed a Reverse fault
Answer:
1-In geology, epeirogenic movement (from Greek epeiros, land, and genesis, birth) is upheavals or depressions of land exhibiting long wavelengths and little folding apart from broad undulations. ... Epeirogenic movements may divert rivers and create drainage divides by upwarping of the crust along axes.
2-Normal Fault: In the field of geology, a normal fault is a type of dip-slip fault where the hanging wall moves downwards from the footwall. The average dipping angle of a normal fault ranges from 45 to 90 degrees. Normal faults are the opposite of reverse faults.
3-While orogenic movement horizontal movements of plates or it is also known as the mountain forming movements act tangentially to the earth surface as in plate tectonics . In orogenic process plate tectonic and volcanic form mountains. Due to this process the crust is severally deformed into folds.
4-a steep-sided valley formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
5-The Intermontane Plateaus of the Western United States is one of eight U.S. Physiographic regions of the physical geography of the contiguous United States. The region is composed of intermontane plateaus and mountain ranges
6-a raised elongated block of the earth's crust lying between two faults.