Continental crust is primarily witch kind of rock

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)

Observations show that interstellar clouds can have almost any shape and