All of the following are orogenic belts except: Himalayan Mountains Alps Midcont
ID: 236494 • Letter: A
Question
All of the following are orogenic belts except:
Himalayan Mountains
Alps
Midcontinent Rift
Rocky Mountain
True or False? Oceanic crustal rocks have a chemical composition that is dominantly of magnesium and iron silicate minerals
A rhyolite is a igneous rock that is characterized as:
fine grained
coarse grained
intermediate grained
both A and C
Sedimentary environments of deposition may be termed:
continental or terrestrial
transitional or marginal
marine
all of the above
Glacial sediments are classified as:
till
drift
ooze
A and B
all of the above
A.Himalayan Mountains
B.Alps
C.Midcontinent Rift
D.Rocky Mountain
Explanation / Answer
1.All of the following are orogenic belts except: C.Midcontinent Rift
2.True ; A term that is sometimes used for oceanic crust rocks is sima, which is short for magnesium silicate, a common component of these rocks. Another term for these undersea igneous rocks is mafic, which comes from the fact that they are high in magnesium and iron. Basalt and gabbro are examples of mafic rocks.
3. A. Grain size: Fine to very fine. Texture: Frequently shows altering layers that differ slightly in granularity or colour. Phenocrysts not uncommon (porphyritic rhyolite).
4. D. Sedimentary environments of deposition may be found anywhere.