Answer:
it is used for welding and cutting
We know this because of the discovery of fossils and bones. We can find out roughly when they existed because of carbon dating.
Answer:
Metal
Explanation:
In chemistry, an alkali is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element. An alkali also can be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0.
Good conductors of electricity and heat, form cations by loss of electrons,
