Geologists can determine the actual age of features on a planet by the radiometric dating method in which the age of the rocks is calculated by the natural decay of the radioactive isotopes of elements such as carbon.
In the radiometric dating method, the radioactive minerals in rocks are used. The radioactive isotopes, which are the chemical elements, naturally break down and decay to form a new isotope.
Each radioactive element has a unique decay rate which is known. Hence, the radioactive isotopes are crucial for the geologist to compare and identify the age of the rocks and furthermore, the planet.
To learn more about here isotopes here
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Which group of people established political boundaries in West Africa? Can someone help plz
The answer is D. 1.3 billion
As the two plates collide,the denserr oceanic plate will subduct under the less dense continential plate, causing the continential plate to arch up and form a mountain range.
Let's look into it one by one:
A. An underwater mountain range will will run along the boundary on the oceanic plate. - This is false.
As the oceanic plate subducts under the continential plate, there is no chance for the denser material to accumulate while subducting. What would be find instead is ocean trench.
B. A mountain range will form in the middle of the continental plate. - This is false.
Although pressure will be applied and there would be stress accumulating on the continential plate, the middle is very unlikely to be affected.
C. A mountain range will run along the boundary on the continental plate. - This is true.
As the subduction happens, the continential plate will accumulate as it is less dense. The rock would fold up to form mountain ranges. For example, Rockies is one off the mountain range along the plate.
D. A chain of islands will form along the boundary of the oceanic plate. - This is false.
Similarly to A. it is not possible for the plate to accumulate when it slides under the other plate.
Therefore the answer is C. A mountain range will run along the boundary on the continental plate.
Hope it helps!
