The word phase means to change a part of a development
Alternative energy sources are those that do not deplete natural resources and do not harm the environment.
Options A, B, and C are all fossil fuels, which we know can be depleted and harm the environment.
The only valid option here is D, Geothermal energy.
Geothermal energy is both renewable and environmentally friendly.
The correct answer is option D. copper (Cu)
Malleability is the ability of metals to be hammered into sheets.
Metals are often required for different applications. The ability of metals to be hammered into sheets is called malleability.
Malleability of a metal is closely related to its density. The denser the metal, the less easily malleable it is.
Both copper and strontium are metals but copper is denser than strontium hence copper is less malleable than strontium.
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