So, first of all let me explain the process of hydration to you.
The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.
Considering this information, the answer is D.
Answer:
Maybe because their was a war right beside Ethiopia (south Sudan war) and refugees may have came here but got kicked out do to over population?
Explanation:
Answer:
Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions. So, scientists study the path and speed of these waves through the earth to decipher boundaries and the materials that make up the layers.
Explanation:
The area referred to in the question is missing but taking into account the area of the world as a whole, the answer would be A)Atlantic and Pacific.
The rise of China's naval power under Admiral Cheng-Ho occurred during the b) Ming dynasty.
