Answer:
I am confused on what this is supposed to be, but if you are talking about chemicals, then your answer is sulfur.
Hoped this is what you're looking for. Sorry if it isn't. I would love to help, but it needs to be more specific.
71 percent of the Earth's surface is covered with water. The visible bodies of water are referred to as surface water and water found underground as soil moisture and in aquifers is referred to as groundwater. <span>Humans use both ground and surface water.</span>
20% of the world's freshwater supply comes from groundwater and 80 % from surface water.
The mass of an atom depends only on the mass of the nucleon, since the mass of the electrons is negligibly small. Protons and neutrons have approximately the same mass, which again is equal to the unit mass , and their total number is the mass number of atoms and is denoted by the letter A.
Explanation:
- A proton (p +) is a positively charged particle whose mass is 1u, and its relative charge is q (p) = + 1.
- A neutron (n0) is a neutral particle without charge, of mass approximately equal to that of protons. The relative charge q (n) = 0.
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In the US, there was a trade system where in West Africa would capture and sell slaves to slave traders in the US or many other European countries.