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3 years ago

How does the formation of oil differ from the formation of coal

1 answer:

8 0

The formation oil, that is, sweet crude, is typically that accumulate on the seafloor and "kitchen" of the geothermal gradient to be altered in petroleum products.while Most of the coal we use now was formed about 300 million years ago, when much of the earth was covered by steamy swamps.

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Which step in transcription occurs first

Svetradugi [14.3K]

Transcription Initiation. The first step in transcription is initiation, when the RNA pol binds to the DNA upstream (5′) of the gene at a specialized sequence called a promoter (Figure 2a). In bacteria, promoters are usually composed of three sequence elements, whereas in eukaryotes, there are as many as seven elements ...

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3 years ago

Read 2 more answers

Which of these best explains the ability of small insects to walk on the surface of still water?

trapecia [35]

Surface tension is caused by the attraction of the particles in the surface layer by the bulk of the liquid.

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2 years ago

1. Although their concentration in the atmosphere is lower than carbon dioxide, ____________________ absorb Earth's outgoing rad

cestrela7 [59]

Answer:

1. Trace gases 2. Climate feedback mechanisms 3. Positive feedback mechanisms 4. Aerosols 5. Negative Feedback Mechanisms 6. Positive feedback mechanism

Explanation:

Using the knowledge of global warming as a result of climate change, we can provide the following answers to fill in the gap:

1. Trace gases

Greenhouse gases provides a natural effect known as greenhouse effects. This effect is achieved when greenhouse gases trap and absorb infrared radiation, in form of heat, thereby slowing down the loss of he into space. This effect ensures the earth remains habitable as the temperature of the earth would drop causing freezing of the earth. Life would almost not exist in the absence of this phenomenon caused by greenhouse gases. Carbon dioxide accounts for the highest percentage by volume of the total greenhouse gases found in the atmosphere. Trace gases such as argon are found in minute quantities in the atmosphere. Hey also have the ability to absorb infrared rays.

2. Climate feedback mechanisms

Climate feedback mechanism is a kind of continuous cycle that describes how the system responds to the changes it is being impacted on. The change can either produce an increase or decrease in the warming effect. There are basically 2 types of feedback mechanism: Positive and Negative feedback mechanism. A positive feedback mechanism involves changes that reinforce the increase of the temperature of the system, while negative feedback mechanisms involves processes that reduce the effect of warming, causing a drop in temperature of the system.

3. Positive feedback mechanisms

Effects that involve processes that helps in pushing the temperature of the climate system up, thereby producing additional warming effect on the initial warming trend of the system are said to be identified as Positive feedback mechanisms. Examples of such effects is melting of ice, especially as more pronounced in polar regions.

4. Aerosols

Aerosols can be in form of fine solid particles or liquid droplets suspended in the air. Examples of aerosols include dust, fog, smoke or air pollutants. They have the ability to scatter solar radiation and change the reflectivity of the earth. These effects created by aerosols have a cooling effect on the climate system, as a against the effect produced by greenhouse gases. The effects caused by aerosols are examples of negative feedback mechanisms.

5. Negative Feedback Mechanisms

An example of such effects is the effect produced by aerosols. Such effect cools the system which is opposite to the warming trend of the system.

6. Positive feedback mechanism

Decrease in surface reflectivity, and increase in surface solar energy absorption as a result of reduced sea ice would further reinforce the warming trend of the system, such change a positive feedback mechanism.

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3 years ago

For dating what kinds of Geologic samples containing uranium is 238U most useful? Why?

slavikrds [6]

Answer:

After C14, Uranium238 is most widely used mineral in geological or archaeological dating.

Explanation:

U238 is generally used to date the rock materials, to know the age. As we know the half-life of U238, it is easy to identify the age of the materials containing uranium 238. It can be called as absolute dating method as it determines the exact age of the uranium contained material. It is a type of radiometric dating.

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2 years ago

Why do you think that plants have both Chloroplasts AND mitochondria?

LuckyWell [14K]

Answer:

Explanation:

ells need both chloroplasts and mitochondria to undergo both photosynthesis AND cell respiration. After photosynthesis, which chloroplasts are needed for, which yields oxygen and glucose, plants need to break down the glucose and they use cell respiration to do this, which happens in the mitochondria.

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3 years ago