Radiometric dating is a kind of technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.
I believe the correct answer is upwelling. Lets say we have producers such as plankton. well upwelling currents bring dead matter from the ocean floor up to the surface, creating plankton.
Oxygen is the answer for this question.
Formed by erosion created by seafloor spreading
RIVER DELTAS ARE formed by erosion created by seafloor spreading
NOT:
caused by the movement of tectonic plates areas of infertile, rocky soil
Answer: 60 degrees.
Explanation: If two angles measure 60 degrees, that means that the triangle is equilateral and the third angle is also 60 degrees. You can also just add the two given measures and subtract the sum from 180 degrees.
