The reason why some igneous rocks are smooth and some are coarse is the manner in which they formed. We can simply divide the igneous rocks into intrusive and extrusive ones.
The intrusive igneous rocks are formed deep into the ground. The magma that has formed this rocks has been exposed to higher temperatures and pressures. That has led to a very slow cooling off of the magma. Because the magma has been cooling off slowly, the crystals had time and the right conditions to grow larger, thus making the intrusive igneous rocks coarse.
The extrusive igneous rocks are formed on the surface. They have been formed by the lava that once it come out on the surface has been exposed to much lower temperatures and pressures. That has led to very quick cooling off of the lava. Because the lava has cooled off quickly, the crystals didn't had time to grow in size, thus they have remained very small, almost unnoticeable, thus making the extrusive igneous rocks smoother.
Answer:
Trenches are not found int he Appalachian mountain province today.
Explanation:
1 is not correct because there is an abundance of metamorphic rocks, which is not weird considering the age of this mountain range.
2 is not correct because this mountain range has been close to intense volcanism during its formation, so it still has some of the volcanic rocks preserved.
3 is not correct because there are a lot of folded and faulted mountain ridges, many of which are visible at the surface today.
4 is not correct because these mountains rose from the ocean, so there are remnants of an ancient floor at places.
5 is not correct because with the erosion over hundreds of millions of years, valleys have been gradually formed at the periphery of this mountain range.
6 is not correct because the top layers of this e range are predominantly made of sedimentary rocks.
7 is correct because the trenches that existed in this area have disappeared a couple of hundreds of millions of years ago, mainly because the area has been gradually moving away from the tectonic boundaries and became an area that is tectonically inactive.
Answer:
they contain vitamins and nutrients which contribute to the growth of you body
Petroleum, natural gas, coal, nuclear, and renewable energy, in order from greatest to least
Great salt lake is not a Great Lake