HELP Earth’s mantle is

a.

a layer of molten metal.

b.

a layer of hot rock.

c.

a dense ball of solid metal.

d.

a layer of rock that forms Earth’s outer skin.

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves

Which form of pure carbon is so hard that it can be used in cutting tools?