Hello!
To answer your question lets go over what Chemical Sedimentary Rock is.
Chemical Sedimentary Rocks are formed by the cementation, saturation and deposition of minerals in the solution causing them to be inorganic and preciptate.
The most known example of this is rock salt.
Of the list you have provided of possible examples the following are defined as chemical sedimentary rock:
- Rock Salt
- Iron Ore
- SOME limestones
I hope this helps in answering your question.
Answer:
D.The land is populated with a group of people
B.There is a government ruling land and people
Answer:
i think the type of agriculture is found in both Latin America and Africa is coffee
Explanation:
Because Africa has the cash crop coffee and Latin america has the coffee from Brazil and Colombia
Answer:
b. flat rotation curves in spiral galaxies
Explanation:
Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.
Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.
The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.
Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.
