Why do mass extinctions occur and why do they often mark divisions of geologic time?

Answers

Answer 1

Answer: Mass extinctions occur for many reasons. Changes in the environment might make it impossible for the local life to survive, diesease or drought might strike, or there might be a natural disaster. These extinctions make good divisions in geologic time because they are easy to locate over a wide area and mark a definitive change in the Earth's systems.

Related Questions

Most of Saturn is much less dense than most of Earth. Yet Saturn's mass is much greater than Earth's mass. How can this be so?
Which evolved during the paleozoic era?
What two types of electromagnetic waves do microwaves overlap
Low air pressure systems are usually associated with A.clear, dry weather B.cloudy, wet weather C.cold, dry weather D.hot, dry weather
Most metallic ores are produced by which two types of processes? metamorphic and sedimentary igneous and metamorphic igneous and sedimentary cementation and compaction

How did the Grand Canyon get it's name?

Answers

The grand canyon got his name from from John Wesley Powell.

it was named by Powell its foot at the entrance of Nonnow valley and its length of 238 miles he named it the grand canyon on his first trip

Is the physical process responsible for soil creation

Answers

Answer:

Weathering

Explanation:

Weathering is the process by which large pieces of rock are broken down by natural processes into smaller pieces. Eventually, through the many types of weather and then compacting, soil is formed. Weathering is divided into two general categories: physical weathering and chemical weathering. An example of physical weathering is thermal stress (expansion and contraction due to heating by the Sun), while an example of chemical weathering would be the breakdown of rocks by acids such as carbon dioxide.

Subduction zones are found under which kind of plate?A.stationary
B.uplifting
C.divergent
D.convergent

Answers

D. convergent A subduction zone is formed at a convergent plate boundary when one or both of the tectonic plates is composed of oceanic crust. The denser plate, made of oceanic crust, is subducted underneath the less dense plate, which can be either continental or oceanic crust.

D. Convergent
Two lithospheric plates converge causing one to subduct under the other creating a subduction zone.

What are the dangers of invasive species quick pls k121 they crowd native animals from the natural habitat
2 they kill native species
3 they can multiply quickly and become a nuisance people
4 most in invasive species introduce to plant animals and humans
multiple choose

Answers

Answer:

1 2 and 3

Explanation:

i did the quiz

Answer:

All

Explanation:

Invasive species can do ell of these some more than other

What would be evidence of a galaxy moving toward earth

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The answer is : The wavelengths of light coming from a galaxy will be shorten.
I hope this helped!

Whàt is the synonym of worried

Answers

Well, a synonym is a word which is nearest in meaning to another word. For example, the synonym of cut can be tear.
Anyway, i think the synonym of worried is troubled or bothered. Hope i helped. Have a nice day.

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All rectangles are similar because they have congruent corresponding angles (all right angles).True False