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Alexxx [7]
3 years ago
7

SCIENCE--Which of the following was one of the earliest events allowing for the production of oxygen in the atmosphere? Select o

ne: a. Plants photosynthesizing carbon dioxide. b. Bacteria photosynthesizing dissolved carbon dioxide in oceans c. Volcanoes releasing oxygen into the atmosphere
Geography
1 answer:
gizmo_the_mogwai [7]3 years ago
3 0

Answer:

b. Bacteria photosynthesizing dissolved carbon dioxide in oceans

Explanation:

The levels of oxygen that we know nowadays in the atmosphere have not been like this in the more distant past. In order for the oxygen to start building up and change the composition of the atmosphere, something needed to happen, and that something was the cyanobaceteria. The cyanobacteria was able to perform photosynthesis, so it started to use the dissolved carbon for it, while in meantime it was releasing oxygen in the atmosphere. As the cynaobacteria was growing in numbers, over the course of millions of years, it managed to propel enough oxygen in the atmosphere so that the other organism can start developing, thus changing the world forever.

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Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock c
anastassius [24]

Answer:

Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock. ... This changing of rock types is called the "Rock Cycle".

Explanation:

Hope this helps!

6 0
3 years ago
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Which of the following accurately describe some aspect of gravitational waves?
IrinaK [193]

Answer:

- the first direct detection of gravitational waves came in 2015

- gravitational waves are predicted to travel through space at the speed of light

-  the existence of gravitational waves is predicted by Einstein's general theory of relativity

Explanation:

The gravitational waves are waves that are produced by the objects, and depending on the mass of the object they can be stronger or weaker in their influence.

These waves have been in the minds of the scientists for more than a century now, with Einstein predicting them in his theory of relativity. The only problem with these waves was that there was no proof of them. The proof finally came in 2015 when these waves were detected from the first time, with two black holes to be thanked for that as they were the source of them.

These waves are predicted to be able to travel with the speed of light through space when they have small amplitudes.

6 0
3 years ago
How much rainfall does Mecca receive?
vesna_86 [32]
Mecca receives 4.3 inches of rainfall a year, mostly in the winter months. 
7 0
3 years ago
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Most of the time in the atmosphere, the upward-directed pressure gradient force is exceeded by the downward pull of gravity.
Lisa [10]

Answer:

Ture

Explanation:

  • The pressure gradient is the force that is produced due to the rotation of earth pressure cells that creates lighter air to move upwards and heavier to move downwards due to the difference in densities of air.
  • As the air above consists of lighter elements the oceanic air mostly consist of diatomic molecules of oxygen and nitrogen thus containing a large amount of water vapor, all these molecules have a mass that are pulled down by the gravity and this pull of gravity on columns of gas applies a force what we see an atmospheric pressure.
  • The gas particles and molecules of heavy and denser matter get stuck at the ground, similarly, as the air cools is descends and warm air rises. Thus upwards and downward motion of air causes convergence and divergence of molecules.
3 0
3 years ago
Which best describes the location of the picnic area?
Agata [3.3K]

Answer:

The elevation changes from 635 to 600 at the picnic area.

Explanation:

In the picnic area which is close to point 4 on the map, the elevation changes from 635 to 600. We see that the site chosen for the picnic has a very gentle elevation and would be easily taken as a flat plain surrounded by hills.

The contours here are far apart and it implies a flat area with gentle slope. The only creek here is the equation creek. The area is below 635.

4 0
3 years ago
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