Answer to Question 1
Answer: The principle of isostasy is the state of equilibrium between the buoyant force of the asthenosphere and the downward force of gravity. The lithosphere floats on the denser mantle. Because the pressure exerted on the mantle by the lithosphere must be the same at any given depth, the lithosphere adjusts its position until a state of equilibrium is achieved. The thicker (but less dense) continents stand higher on Earth's surface and extend deeper into the mantle than the thinner (but more dense) ocean basins. Seismic waves reveal the extension of continental and oceanic crust into the mantle.
Answer to Question 2
Answer: Fluids enclosed in pore spaces act as a catalyst to aid metamorphic reactions. When a rock is subjected to increased temperature and pressure, the amount of pore space decreases and fluid is squeezed out. Fluids readily react with the surrounding rock. In general, the more fluid, the faster the reaction.
The patient is undergoing an allergy skin test by receiving subdermal inoculations of allergens. Inf
All of the homes in this new neighborhood of Brentwood, California, are for sale, evidence of the co
Four kinds of evidence supporting the theory that species evolve.
Hierarchy of scientific evidence
Experimental evidence of cytoplasmic localization in an amphibian oocyte.
Experimental evidence that signals from dorsal lip cells initiate amphibian gastrulation. A dorsal l