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denis23 [38]
3 years ago
13

Which earth layer contains convection currents that are believed to be responsible for the movement of Earth's tectonic plates?

Biology
1 answer:
Maslowich3 years ago
5 0
Convection in the asthenosphere is the main reason for the movement of tectonic plates.
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Drew observed in an experiment that algae in a nearby lake could be found at six meters below the water's surface on a clear day
Elenna [48]

Answer:

The depth at which Drew found the algae

Explanation:

The dependent variable was the depth at which he found the algae, because that is what he measured on each day.

The independent variable was the sky conditions, since that changed from clear to cloudy, which impacted the dependent variable/the depth of the algae.

7 0
3 years ago
plzzzzz help ..........How do the processes of conduction, convection, and radiation help distribute energy on Earth?
kodGreya [7K]

ENERGY TRANSFER IN THE ATMOSPHERE:

Atmosphere surrounds the earth made up of different layers of gases such as Argon, Oxygen, Nitrogen, Exophere, Thermosphere, Mesophere, Stratosphere, Toposphere

The energy that drives the climate system comes from the Sun. When the Sun's energy reaches the Earth it is partially absorbed in different parts of the climate system. The absorbed energy is converted back to heat, which causes the Earth to warm up and makes it habitable. Solar radiation absorption is uneven in both space and time and this gives rise to the intricate pattern and seasonal variation of our climate. To understand the complex patterns of Earth's radiative heating we begin by exploring the relationship between Earth and the Sun throughout the year, learn about the physical laws governing radiative heat transfer, develop the concept of radiative balance, and explore the implications of all these for the Earth as a whole. We examine the relationship between solar radiation and the Earth's temperature, and study the role of the atmosphere and its constituents in that interaction, to develop an understanding of the topics such as the "seasonal cycle" and the "greenhouse effect".


The Sun and its energy.

The Sun is the star located at the center of our planetary system. It is composed mainly of hydrogen and helium. In the Sun's interior, a thermonuclear fusion reaction converts the hydrogen into helium releasing huge amounts of energy. The energy created by the fusion reaction is converted into thermal energy (heat) and raises the temperature of the Sun to levels that are about twenty times larger that of the Earth's surface. The solar heat energy travels through space in the form of electromagnetic waves enabling the transfer of heat through a process known as radiation.


Solar radiation occurs over a wide range of wavelengths. However, the energy of solar radiation is not divided evenly over all wavelengths but is rather sharply centered on the wavelength band of 0.2-2 micrometers (μm=one millionth of a meter).


The physics of radiative heat transfer.

Before proceeding to investigate the effect of solar radiation on Earth we should take a moment to review the physical laws governing the transfer of energy through radiation. In particular we should understand the following points:


The radiative heat transfer process is independent of the presence of matter. It can move heat even through empty space.

All bodies emit radiation and the wavelength (or frequency) and energy characteristics (or spectrum) of that radiation are determined solely by the body's temperature.

The energy flux drops as the square of distance from the radiating body.

Radiation goes through a transformation when it encounters other objects (solid, gas or liquid). That transformation depends on the physical properties of that object and it is through this transformation that radiation can transfer heat from the emitting body to the other objects.


Radiation transfer from Sun to Earth.

Properties of Solar radiation: The Sun is located at the center of our Solar System, at a distance of about 150 x 106 kilometers from Earth. With a surface temperature of 5780 K (degrees Kelvin = degrees C + 273.15), the energy flux at the surface of the Sun is approximately 63 x 106 W/m2. This radiative flux maximizes at a wavelength of about 0.5 μm.

Solar radiation on Earth: As the Sun's energy spreads through space its spectral characteristics do not change because space contains almost no interfering matter. However the energy flux drops monotonically as the square of the distance from the Sun. Thus, when the radiation reaches the outer limit of the Earth's atmosphere, several hundred kilometers over the Earth's surface, the radiative flux is approximately 1360 W/m2.


4 0
3 years ago
24. Which organism would occupy the
Nadusha1986 [10]

Answer:

The organism to have maximum energy would be the algae since ii will be at the lowest level. so the answer is 'B'.

Explanation:

The pyramid of energy shows the flow of energy from one trophic level to other. The lowest trophic level is occupied by the producers. In this case algae acts as the producer. Krill acts as the primary consumer, followed by leopard seal as the secondary consumer and finally killer whale as the tertiary consumer. The <em>lowest trophic level </em> contains maximum energy.

As we go upwards, only 10% of the energy gets transferred to the next trophic level.

6 0
3 years ago
You have a 15kb plasmid. EcoRI cuts the plasmid into 7kb and 8kb pieces, and BamHI cuts the plasmid into 1kb and 14kb pieces. If
Harman [31]

Answer:

a. Bands at 1kb, 6kb and 8kb

Explanation:

The EcoRI and BamHI are the restriction enzymes which cut the DNA sequence especially a plasmid at specific sites called the restriction sites.

The restriction enzymes produces bands of specific length therefore these restriction enzymes are used to estimate the approximate length of the DNA.

In the given question, the

1. EcoRI- produces two strands of 7 kb and 8 kb

2. BamHI- produces two strands of 1kb and 14kb

This shows that the length of DNA sequence is 15kb

But when the DNA strand are digested with both the enzymes simultaneously then it will produce three bands as:

i) 14 kb can be broken down in 2 bands of 6 kb and 8 kb

ii) 1 kb band is already produced by the Bam HI.

This shows that 1+6+8= 15 kb

Thus, Option-A is correct.

5 0
3 years ago
In a cancer patient undergoing chemotherapy, the decision to utilize a csf capable of specifically stimulating the production of
devlian [24]
It would require that the csf acts exclusively on : Myeloblasts

myeloblasts is a unipotent stem cell, which differentiate into one of the effectors of the granulocyte series. 
It is commonly found in bone marrow.
6 0
3 years ago
Read 2 more answers
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