Answer:
Cement is a combination of calcium, silicone, aluminum, iron and lots of other ingredients to make side walks, home made crafts, etc. The person who invented concrete is Joseph Aspdin.
Explanation:
There are three variables independent, dependent ,and controlled
Answer:
The chemical equation needs to be balanced so that it follows the law of conservation of mass.
Explanation:
Answer:
Radiation
Explanation:
Sun rays shine on earth. Thats radiation.
The nonmetal elements have a negative charge.