The diagram shows two energy resources.

which labels best categorize the resources shown in the diagrams?

a) x: natural

y: human-made

b) x: limited

y: unlimited

c) x: can be replaced

y: cannot be replaced

d) x: used in power plants

y: not used in power plants

the answer is e2020

X: can be replaced Y: cannot be replaced

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle