A. how the Moon's appearance changes
Explanation:
Descriptive investigation use very careful observations and measurements to develop findings.
Most geologists, meteorologists and astronomers use descriptive investigation to develop their findings.
- Since most of their subject matter is inaccessible.
- Descriptive investigation is used for indirectly making inquiries
- It involves the development of an inquiry without formulating any hypothesis.
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Kinetic energy of the molecules increases and we are close to boiling point liquids. Then strain the liquid and gas pressure reached equilibrium
.
the alkaline eart metal s are
Beryllium
Magnesium
calcium
Strontium
barium
out of these Magnesium reacts with oxygen and produces bright light due to formation of MgO
all other metals also form oxides but the oxide of Mg is brightest
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