They are used to define periods Geological time.
<span>The mineral crystals in obsidian are too small to see without a microscope. This is because the rock cools so rapidly from magma that crystals barely have time to form. Obsidian is a normally happening volcanic glass framed as an extrusive molten shake. It is delivered when felsic magma expelled from a well of lava cools quickly with negligible precious stone development.</span>
Answer:
Convergent evolution
Explanation:
Convergent evolution is a type of evolutionary change that occurs in which two species of organisms that do not share the same ancestral line evolve similar traits independently as a result of similarity in their environmental conditions that they both have to adapt to. Green algae and brown algae can be said to show convergent evolution as they appear similar but are not closely related, meaning they do not share the same ancestral origin
Answer:
When precipitation falls over the land surface, it follows various routes in its subsequent paths. Some of it evaporates, returning to the atmosphere; some seeps into the ground as soil moisture or groundwater; and some runs off into rivers and streams.
Explanation:
Answer: D. strata
Explanation:
I took a small quiz and it had this same question on it and the answer was strata
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