The North American and European plates of the

Earth's crust are drifting apart with a relative speed of

about 25 mm/yr. Take the speed as constant and find when

the rift between them started to open, to reach a current

width of 2.9 x 10^3 mi.

Rock can be weathered and eroded in the rock cycle. What might happen with the resulting rock particles? A. New rock is formed from other rock by great heat and pressure. B. Igneous rock is formed. C. Rock is melted. D.

What is the force in units of newtons of a 40 pound object? a) 176 N b) 9.1 N c) 4.0 N d) 400 N

Explain why substances in different states have different densities?

During bicycling, a 70 kg person's body produces energy at a rate of about 500 W due to metabolism, 80% of which is converted to heat.

A box is sliding up an incline that makes an angle of 14.0° with respect to the horizontal. the coefficient of kinetic friction between the box and the surface of the incline is 0.180. the initial speed of the box at the bottom of the incline is 2.

Which of the following methods of improving air quality does not require advanced technology?

When two waves with the same amplitude overlap so that a crest lines up with a trough, the resulting wave ...

Suppose the Sun suddenly stopped emitting light. How long would it take, in seconds, for the Sun's light to disappear on Earth? (Hint: The Sun is an average of 150 million km from Earth).

Do you think companies should be required to disclose ingredients in their chemicals if there are environmental concerns. Explain why or why not. Use at least three pieces of evidence.

We expect a car's highway gas mileage to be related to its city gas mileage (in mpg). Data for all 1209 vehicles in the government's 2016 Fuel Economy Guide gives the regression line highway mpg=7.903 + (0.