Which two layers of Earth are mainly composed of iron and nickel? inner core outer core lower mantle upper mantle crust

A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward.

Write the word equation, balanced symbol equations and ionic equation got magnesium carbonate

A stationary motion detector sends sound waves of 0.225 MHz toward a truck approaching at a speed of 33.0 m/s. The speed of sound in the air is 343 m/s. What is the frequency of the waves reflected back to the detector

A screw incorporates which other simple machine? lever wheel and axle inclined plane pulley

3. All the water on Earth, including the water in the atmosphere, makes up the A. biosphere. B. hydrosphere. C. atmosphere. D. geosphere.

Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?

Should young people be allowed to do extreme sports? (give me two reasons why) 1. Opinion: 2. Reason why: 3. Reason why:

A light ray is incident on a reflecting surface. If the light ray makes a "35°" angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

Reimbursement means that a client is A. able to apply for healthcare insurance and refunded for a partial sum of the payment plan by the state. B.

Meg runs a 10km race in 45 minutes (0.75 hours). What was her speed in kilometers per hour? a. 22 km/hr b. 7.5 km/hr c. 4.5 km/hr d. 13 km/hr