Answer:
Seafloor spreading results from intense activity in the upper mantle which cracks the crust and pushes it away.
Explanation:
Seafloor spreading is a process that was first noticed by Alfred Wegener and was used by him in his theory of plate tectonics. There are three types of plate boundaries; convergent boundary, transform boundary, and divergent boundary. The last one is the one where seafloor spreading occurs.
The convection currents in the mantle are the process that breaks up the crust and move the tectonic plates, and when there is higher activity than usual at some place it results in break up the crust of an already existing tectonic plate. Basically, magma rises at a higher rate and pushes through the crust, in this case, the oceanic crust, and it manages to gradually break through it and come out on the seafloor. By doing so, the magma and the pressure from below are pushing the two now divided parts of the plate. As the space between the two different parts becomes larger and large the density of the crust becomes smaller and smaller so more and more magma rises through. The magma quickly solidifies on the ocean floor and piles up, thus creating an underwater mountain range known as a mid-ocean ridge.
A nonrenewable resource<span> is a </span>resource<span> of economic value that cannot be readily replaced by natural means on a level equal to its consumption. Most fossil fuels, such as oil, natural gas and coal are considered </span>nonrenewable resources<span> in that their use is not sustainable because their formation takes billions of years.</span>
Answer:
(a) Lower densities and higher thermal gradient
Explanation:
Over pressured zones during penetrating are those zones where development liquid weight (higher than expected) surpasses the mud weight. These are liable for victories.
- The pore liquid substance in shales of the over constrained zone is higher than the ordinary compelled shales. That implies, the porosity of shales in over pressured zone is higher as well thus the thickness of the over forced zones are lower than the ordinary influenced shales.
- Because of the nearness of more liquids in the pores of an over constrained shale, the warmth produced because of penetrating behaviors gradually in over influenced shale than a shale in typical weight zones. Accordingly, warm inclination will be higher in over forced shales.
The answer would be "Rhyolite Porphyry"
It is a rock that contains
a) Orthoclase + Orthoclase phenocryst = 35 % + 15 % = 50 % = plagioclase feldspar
b) Quartz = 30%
c) Alkali fled spar = 20%
