This is the solid outermost layer of the earth, including the crust and upper-mantle.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical

If frequency goes up, what happens to wavelength? does it get shorter or longer?