Biology, 14.03.2020 02:57 briseidam6683

.
Describe the earth’s first atmosphere and explain how it changed gradually to its present composition.

Answers: 3

Show answers

Answers

Answer from: aly3048

Our planet's atmosphere has changed quite a bit over time. See the explanation below.

Explanation:

The planet is generally thought of as having three distinct atmospheres over the course of its lifetime.

When earth was first formed, its atmosphere was likely composed of hydrogen, helium, and other gases that contained hydrogen. Yet this atmosphere didn't last for very long because the solar wind from the sun blew it away. Solar wind is stream of charged particles such as electrons, protons, and alpha particles. We now have a magnetic field surrounding earth that shields us from solar wind.

The second atmosphere formed a little after 4.5 million years ago (mya) and was produced due to volcanic outgassing. Outgassing is the release of gas that was trapped in some other material. In this case, volcanic outgassing released hot gases trapped deep within the interior of the planet. Water vapor, carbon dioxide, methane, ammonia, and other gases similar to the ones produced by volcanoes today were expelled.

Over a vast amount of time, millions of years, the earth gradually cooled. When the temperature dropped enough, water vapor condensed and went from a gas to liquid form. This created clouds. From these clouds, the oceans formed and the oceans absorbed a lot of the carbon dioxide in the atmosphere. A small amount of oxygen was produced by the photolysis of carbon dioxide and water vapor by ultraviolet radiation.

Explanation:Our planet's atmosphere has changed quite a bit over time. See the explanation below.

Explanation:

The planet is generally thought of as having three distinct atmospheres over the course of its lifetime.

Lastly, we have the third atmosphere. Around 2.5 mya, the amount of oxygen available in the atmosphere started to rise due to the evolution of photosynthetic organisms that produced oxygen. These organisms were oceanic cyanobacteria. Over time, aerobic organisms evolved and consumed some of the oxygen produced. Read more about how oxygen became a major part of our atmosphere here.

This is the composition of the atmosphere we have today:

Answer from: Quest

airlines i think? or a cruise boat? does this work out for u? ?

Answer from: Quest

That is false even though water expands when frozen nothing changes at all

Another question on Biology

Biology, 21.06.2019 19:00

Select the correct answer.which scenario describes unethical lab behavior? o a. danny stores the chemicals required for his experiment in flasks and beakers.b.anna publishes the results of her experiment on the growth rate of saplings.c.jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.

Answers: 1

Answer

Biology, 21.06.2019 22:00

What happens when the cell copies its chromosomes

Answers: 2

Answer

Biology, 21.06.2019 23:30

What is the importantence of the carbon and nitretan cycles in the environment

Answers: 1

Answer

Biology, 22.06.2019 00:00

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Answers: 1

Answer

You know the right answer?

.
Describe the earth’s first atmosphere and explain how it changed gradually to its present c...

Questions