Which of these is not currently a source of usable energy?
A
The sun
B
The moon
Heat from within the earth's crust
D
Running water

B  The moon

Explanation:

There are different source of environmental renewable energy sources which are usable for ourselves.

• The lunar energy has also great scopes in the near future as a renewable energy source.

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the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.