Elements emit colours when heated because electrons in atoms can have only certain allowed energies.Heating an atom excites its electrons and they jump to higher energy levels. When the electrons return to lower energy levels, they emit energy in the form of light. Every element has a different number of electrons and a different set of energy levels. Thus, each element emits its own set of colours. See, for example, mercury and neon above. Those colours are as distinctive to each element as fingerprints are to people.
Answer:
The correct option is;
A. Recharges freshwater aquifers
Explanation:
Sedimentary deposits or formations of rock material with sufficient porosity for water retention are known as aquifers
The episodic movement of water from land surfaces, following a storm or other unsaturated areas into a saturated zone is known as aquifer recharge
The natural source of freshwater aquifer recharge is therefore through rainfall or surface waters from wetlands.
The year that tablet computers were introduced to the market is 2012
