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3 years ago

Approximately how much of the water found on earth is non-fresh

Biology

1 answer:

Damm [24]3 years ago

7 0

Answer:

Around only 2.5% of water on Earth is suitable for drinking but around 1% is easily accessible as most of it is frozen in ice caps and glaciers.

so approximately 67.5% of water on earth is non-fresh

Explanation:

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The bones from an animal found at an archaeological dig have a C614 activity of 0.10 Bq per gram of carbon. The half-life of C61

erastova [34]

C14 is an isotope used in radiocarbon dating techniques to date organic matter remains. The age of these bones is approximately<u> 6890 years.</u>

<h3>What is Carbon 14?</h3>

Carbon 14, also known as radiocarbon, is a radioactive carbon isotope.

Isotopes are the atoms of the same element -carbon- that vary in neutrons and, hence, in their massic number. They are alternative forms of the same element.

The radioactive C14 nucleus contains 6 protons and 8 neutrons and has a half-life of 5730 years.

The term half-life is a reference. It means that an organism that has been dead for 5730 years has half the C14 amount or concentration than the same organism had when it was alive.

Knowing the half-life of an element is useful to determine the age of the dead matter.

C14 is used in radiocarbon dating techniques or methods to estimate the age of fossils. This is a reliable technique used for dating organic samples that are less than 50,000 years old.

<u>Available data</u>:

The half-life of C14 is 5730 years
Bones activity of 0.10 Bq per gram of carbon

To answer this question we can make use of the following equation

Ln (C14T₁/C14 T₀) = - λ T₁

Where,

C14 T₀ ⇒ Amount of carbon in a living body. We know, by bibliography, that living organism activity is 0.23 Bq per gram of carbon. So, C14 T₀ = 0.23 Bq/g

C14T₁ ⇒ Amount of carbon in the dead body. C14T₁ = 0.1 Bq/g

λ ⇒ radioactive decay constant = (Ln2)/T₀,₅

T₀,₅ ⇒ The half-life of carbon 14 = 5730 years

T₀ = Time when the organism was alive

T₁ = Age of bones

Let us first calculate the radioactive decay constant.

λ = (Ln2)/T₀,₅

λ = 0.693/5730

Now, let us calculate the first term in the equation

Ln (C14T₁/C14 T₀) = Ln (0.1/0.23) = Ln 0.4347 =<u> - 0.833</u>

Finally, let us replace the terms, clear the equation, and calculate the value of T₁.

Ln (C14T₁/C14 T₀) = - λ T₁

- 0.833 = - 0.0001209 x T₁

T₁ = - 0.833 / - 0.0001209

T₁ = 6889.99 ≅ <u>6890 years</u>

The bones are approximately<u> 6890 years.</u>

You can learn more about dating organic matter with carbon14 at

brainly.com/question/4149380

#SPJ1

6 0

2 years ago

Which of the following aspects of society is the least affected by limiting factors?

krok68 [10]

Behavior is the least affected by the limiting factors.

Behavior can remain constant throughout the conditions but when necessary, adaptations can occur due to the limiting factors that constrict a certain action.

<span>Adaptation is the unique trait that animals and plants have in order to survive through the evolution of time. </span>

4 0

2 years ago

Draw three different food chains, from this food web, that contain an aphid.

serg [7]

The food chain that would include an aphid include:

Plant ---> Aphid ----> Birds
Plant ---> Aphid ----> Spiders
Plant ---> Aphid ----> Bat

<h3>What is a food chain?</h3>

A food chain is a chart that shows how food is transferred from producers to consumers.

Producers are plants as they are responsible for producing food from inorganic materials using the Sun's energy.

Consumers depend on plants and other organisms.

The food chain that would include an aphid include:

Plant ---> Aphid ----> Birds
Plant ---> Aphid ----> Spiders
Plant ---> Aphid ----> Bat

Learn more about food chain at: brainly.com/question/19066362

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2 years ago

Which statements about the cycle of weathering, erosion, and deposition are true? Check all that apply.

kompoz [17]

The correct statements are-

Erosion occurs even when the mountains are forming. Erosion is the movement of sediments from the broken rocks through the agents like gravity, wind, water and others. It is a constant process occurring even while the mountains are forming. It is affected by gravity.

When new mountains or plateaus form, the cycle starts over. Weathering is the breakdown of rocks by the weathering agents. These sediments move due to the process of erosion. A new sediment may be dropped nearby or in a new place by the process of deposition. Weathering, erosion and deposition occur together as a cycle and have almost leveled the land surface.

Weathering, erosion and deposition have almost leveled earth’s surface. These three processes occur as a cycle and have almost leveled the land surface.

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3 years ago

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A dilated vein that returns blood from the coronary circulation to the right atrium is the __________.

maw [93]

I believe its large blue vessel also known as vena cava

8 0

1 year ago