Answer:
D) the steady, clocklike decay of certain radioactive isotopes over time.
Explanation:
Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks.
For example, when rocks are formed, such as igneous rocks (formed when molten rocks cools), certain radioactive atoms are trapped inside the rocks during this formation process. Then these radioactive atoms decay over time.
The age of the rock can be estimated by comparing the occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.
From the options;
A) this is about the formation of the radioactive molecules and not about radiometric dating
B) this is radiocarbon dating (cabon dating/carbon-14 dating)
C) the <em>assumption </em>is wrong since the radioactive isotopes decays not accumulate.
D) the corect option as I explained earlier.
The Great Barrier Reef is one of the famous wonders of the world that is situated near the East Coast of the Australian continent. In addition to that, the region is most likely known to have a huge presence of coral reefs. Actually, there are many islands east of the reef and one of which is the country of Fiji.
It is true walking in acid rain or even swimming in acid lake is no more dangerous than walking in clean water.
<u>Answer:</u>
<em>4. Amount of food produced in an area
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<u>Explanation:</u>
Agriculture yield is important thing in primary sector, it measures the amount of food produced in an area. Before Green revolution, India’s food grain production is not self sufficient to their own people, so India plan to launch the Green revolution. They approach the Norman Borlaug for implement the green revolution who is the Father of Green revolution. Then, India concentrate on High yielded variety (HYV) seeds, fertilisers subsidy, sufficient drainage for crops and so on. Green revolution increase our main food grains Rice and Wheat, HYV seeds give high yield than traditional agriculture method.
b. Original horizontality
Hope this helps!
