Plate tectonics is the theory that Earth's crust is composed of many plates that are moving slowly over time.
Your answer is D. :)
the answer is b it is composed of protons and neutrons.
hope this helped
Coefficients are numbers in front of variables.
For example, in y=2x, the coefficient is 2.
In the case of chemistry, the coefficient is in front if a chemical symbol and is used to balance a chemical reaction.
Example: O2 + Fe= Fe2O3 (with Fe having a +3 ion)
To balance use the following coefficients:
3O2+4Fe=2Fe2O3
Hope this helps!
The energy of the carbide released is 7262.5MJ.
<h3>What is the energy?</h3>
We know that the reaction between calcium oxide and carbon occurs in accordance with the reaction; 
. The reaction is seen to produce 464.8kJ of energy per mole of carbide produced.
Number of moles of 
produced = 1000 * 10^3 g/64 g/mol
= 15625 moles of calcium carbide
If 1 mole of transfers 464.8 * 10^3 J
15625 moles of calcium carbide transfers 15625 moles * 464.8 * 10^3 J/ 1 mol
= 7262.5MJ
Learn more about reaction enthalpy:brainly.com/question/1657608
#SPJ1
Answer:
metaltoids like mercury can become solid and liquid and are called semiconductors
