What are the components of earths life support system

What is the formula to work out speed?

Which statement best describes how light waves travel in a uniform medium? A. in straight lines B. in extending circles C. in bent lines D. in shrinking ripples

What advice should be given to a friend who thinks that eating healthy is too hard?

What is the purpose of a valve?

A baby has a mass of 5.0kg. The baby is on a train that is traveling east at 72m/s. What is the baby's momentum

What did you notice about crossing two heterozygous genotype?

A toll booth on a turnpike is open from 8:00 AM until midnight. Vehicles start arriving at 7:45 AM at a uniform rate of 6 veh/min. At 8:15 AM the rate drops to 2 veh/min.

A tornado lifts a truck 252 m above the ground. As the storm continues, the tornado throws the truck horizontally. It lands 560 m away from where it was picked up.

The force of attraction between 2 objects is called gravity. Why do you think that an object, like your notebook, pulled towards you? Explain your reasoning. I don't need the answer I just don't understand what this question is asking.

Two planes leave wichita at noon. One planes flies east 30m/h faster than the other plane, flying east at what time will they be 1200 mi apart?