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shusha [124]
3 years ago
14

Obsidians glassy texture indicates that it formed

Biology
1 answer:
OleMash [197]3 years ago
3 0

Answer:

on the surface rapidly

Explanation:

Obsidian glassy texture indicates that the rock formed on the surface rapidly.

Like every other magma, the condition of the environment determines how the magma cools and solidifies.

  • When magma cools rapidly, nucleation centers will be difficult to come- by ..
  • At nucleation centers, minerals aggregates and grows to form different grain sizes.
  • When rapid cooling occurs, not enough time is given for the aggregation around the nucleus.
  • This leaves a rock mass that is finely grained.
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The ancestral finch was a ground-dwelling, seed-eating finch. After the burst of speciation in the Galapagos, a total of 14 species would exist: three species of ground-dwelling seed-eaters; three others living on cactuses and eating seeds; one living in trees and eating seeds; and 7 species of tree-dwelling insect-eaters.
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