Look at the location of elements A,B,C,and D in the following periodic table.Consider the oxides that form when the elements A-D are in their highest oxidation states. 
-Which oxide has the lowest melting point?
Definitions:
Semiarid Climates
Climates characterized by light rainfall, often leading to conditions that support only grasses and shrubs rather than dense forests.
Abundant Precipitation
A high amount of rainfall or snowfall in an area, often leading to increased water availability but possibly also causing flooding and other issues.
Underground
Beneath the surface of the earth, often used to refer to subterranean environments or cultures.
Mature Soil
Soil that has developed all the horizons necessary for plant growth, exhibiting a well-defined structure and fertility accumulated over time.
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