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D. a new substance is formed. if it is chemical change then it is actually changing to something new. In this case a new substance is formed. It is a completely different substance from what you started out with.
The circumference of circle is 20.096 units
<em><u>Solution:</u></em>
Given that circle has a diameter with endpoints at (10, 8) and (5, 4)
To get the diameter, find the distance between the end points
<em><u>The distance between two points is given by formula;</u></em>

Here the points are (10, 8) and (5, 4)

Substituting the values we get,


Thus the diameter is 6.4 units
<em><u>The circumference of the circle is given by formula:</u></em>

Where "d" is the diameter of circle

Thus circumference of circle is 20.096 units
Groundwater is important for us as it is the greatest source for freshwater, crop irrigation and agricultural activities.
In general, groundwater is present in reservoirs and aquifers below the surface of the earth and also most crucial natural source of water for any nation. Groundwater provides fresh drinking water to almost 50% of global population. With an ever increase in global population, the use of groundwater is also increasing.
The primary way of wasting fresh water is its overuse in households such as in kitchen, toilets for taking long showers, washing and bathing purposes.
We can save groundwater by avoiding unnecessary leakage, unnecessary showers, and decreasing shower time.
If you need to learn more about groundwater click here:
brainly.com/question/9617
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Radiometric dating is dating a rock or mineral by measuring the proportions of an original radioactive material and its decay products. We need to know the rate at which radioactive decay occurs and <span>how much radioactive decay has occurred. Hope this answers the question. Have a nice day.</span>