Answer:
Option (D)
Explanation:
The motion of tectonic plates is controlled by both the factors, namely the convection current and gravity. Both this factors occurs simultaneously.
The magma when heated becomes less dense (gravity decrease), and slowly rises up towards the surface of the mantle. As the magma reaches the upper part of the mantle, its temperature decreases and density slowly increases and it eventually sinks. This continuous motion of magma from the core mantle boundary to the surface of the mantle forms a current known as the convection current, that forms in the mantle. It is due to the heat energy radiated from the interior of the earth.
This plate motion takes place in 3 ways namely the divergent, convergent and the transform type of plate boundary.
In the divergent plate boundary, due to the greater density, the oceanic plate subducts below the continental plate.
Thus, in all aspects, the plate motion is initiated by both gravity and gravitational force.
Hence, the correct answer is option (D).
Answer:
The number of trophic level in food chain is limited because at each trophic level a large amount of energy is being utilized for the maintenance of organism and lost as heat.
Explanation:
Explanation:
Biological fitness, also called Darwinian fitness, means the ability to survive to reproductive age, find a mate, and produce offspring. Basically, the more offspring an organism produces during its lifetime, the greater its biological fitness
Answer: Thru Photosynthesis
Explanation: This is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
Answer:
fits letter B
Explanation:
"Nutrient pollution is the process where too many nutrients, mainly nitrogen and phosphorus, are added to bodies of water and can act like fertilizer, causing excessive growth of algae. Nutrients can run off of land in urban areas where lawn fertilizers are used."
This process is also known as eutrophication, and this causes dead zones, as the one in the Northern Gulf of Mexico by the coastal development and the run-off nutrients of the Mississippi River.
NOAA (2019) What is nutrient pollution?
