What did gould and eldridge contribute to the evolutionary theory

Commitments to science are the hypothesis of punctuated harmony, created with Niles Eldredge in 1972 after watchful and point by point examination of fossils. This hypothesis suggests that advancement occurs in uncommon cases of fast expanding developmental change in the middle of long stretches of steadiness. This is as opposed to the hypothesis of transformative gradualism.

Characteristic expected of mineral from lava at earth's surface

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.