Which of the following examples illustrates an energy transfer between the atmosphere and hydrosphere? a. plant roots absorbing water from the soil b. loss of heat from a geothermal vent to the surrounding cooler water c. polar ice reflecting the sun's light back toward space d. convection currents in the ocean mixing warmer and cooler water together

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point