Which part of the ear sends a message to the brain that is recognized as sound?

Sara is creating an experiment. her hypothesis states the following. if i increase the air in my tires, then i will get better gas mileage. if this is her hypothesis what column titles do we need in our date table? a. air pressure in tire (psi) and gas mileage (mph) b. air pressure in the atmosphere (psi) and gas mileage (mph) c. miles (m) and gallons per mile (g) d. old battery and new battery

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Convection currents are caused by differences in what two things?