How did oxygen (O2) get into Earth's atmosphere?

Explain how the sun's position in the sky would change the direction of your shadow if you were to stand in the same place all day.

An open vertical tube has water in it. a tuning fork vibrates over its mouth. as the water level is lowered in the tube, a resonance is heard when the water level is 460 cm below the top of the tube, and again after the water level is 500 cm below

What is the mass of the sun times 54

Near the shore, winds tend to blow out toward the water at night. What drives this process? A. Warm air above the water rises and is replaced by cooler air from the land. B. Warm air above the land conducts heat to the cooler air above the water. C.

Which state of matter has both a fixed shape and a fixed volume

A collision between two billiard balls isa.) closely, a perfectly elastic collisionb.) an elastic or an inelastic collision, depending on the angel between the paths of the ballsc.) a perfectly inelastic collision.

Which of these surfaces gives unpolarized reflected light? Snow Water Glass Metal

O'Malley is riding on a bus which is moving at 10 m/s, and he throws a ball which he observes to be moving at 10 m/s relative to him in the direction of motion of the bus. What speed will Ophelia observe the ball to have?

Part 1. A girl leaves a history classroom and walks 10 meters north to a drinking fountain. Then she turns and walks 30 meters south to an art classroom. What is the girl's total distance traveled? Part 2. Using the information above from Part 1.

Which of the following is an example of a physical change but not a chemical change? A) The log gives off heat and light as it burns B) A tree stores energy from the sun in its fruit C) A penny lost in the grass slowly changes color D) A water pipe