Answer:
D. are brought from the mantle to the surface in magma that hardens into komatiite.
Explanation:
Diamond :
It is the hardest form of carbon.The atomic atoms arrange in the cubic crystal structure and this is known as diamond cubic.Another form of the diamond at room temperature is graphite.This is used for making jewelry.This is also used in the cutting process because it has high strength.
Therefore the correct option for the diamond is D.
Answer:
metals like iron or nickel
Explanation:
Answer:
D. It is caused by flowing negatively charged particles.
Explanation:
Current electricity is caused by flowing negatively charged particles. Current flows in a direction opposite the that of the charged particles.
The negatively charged particles can be electrons or ions in solutions.
As the electrons flows, current is generated in the opposite direction.
The potential difference is what drives the current and it is dependent on the available energy in the cell.
Answer:
1/ As a metal has higher melting point than a nonmetal has, we can guess that sample A is a metal.
2/ The melting point is over 1000 gradius Celcius: 1083 - it's not a low value. And as the sample conducts heat, it is not the element of period N3 in the periodic table, because elements in period 3 do not conduct electricity.
Explanation:
I can not see what the questions 2-3 in your picture is. I answered the question above the table: What can the student conclude about thenidentity of Sample A.
