Hypothesize why you think scientists did not discuss the vast ocean floor ecosystems until the 1970s.

texas-flood watch and coastal flood barriers

california-try and look for under ground water stream

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !