More than a billion years ago, the continent of Africa hit North America, generating enormous pressure and heat while pushing up
the Blue Ridge Mountains to a height of 30,000 feet. Most of these mountains have since been worn away by wind, rain, and the growth of living organisms. The order of the rock cycle in this case is BEST described as A) igneous, sedimentary.
B) metamorphic, igneous.
C) igneous, metamorphic.
D) metamorphic, sedimentary.s.
When both plates collide, heating and high pressure causes recrystallisation of minerals that have been formed before. New mineralogical facies would surface. This is a metamorphic change and the rock becomes a metamorphic rock.
Due to the weathering of this rock, materials are eroded, transported into basins of deposition to form new sedimentary layers. The rock that forms through the compaction and cementation of the sediments is a sedimentary rock.
The stars mass (once it becomes a star) is inversely proportional to its lifetime as a main sequence star. A red dwarf can survive for many billions of years; a star that has twice the mass of the Sun, such as Sirius A, will have 25% of the Suns lifetime.
