How does antarctic ice regulate our earth's climate?
a. it reflects the sun's heat energy, keeping the earth cool.
b. it absorbs the sun's heat energy, keeping the earth warm.
c. it reflects the sun's heat energy, warming the oceans.
d. it absorbs the sun's heat energy, stalling ocean currents.

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block