You are tapping your finger in a pool of water twice every second. A. What is the frequency?
B. What is the period?
C. If the speed is 1m/s, what is the wavelength?​

When the warmer parts go up and the colder parts go down in a circular motion. 

Ican’t exactly answer this, but i can try to give a bit more info here.
astronomers are able to calculate a star’s life expectancy depending on its mass. (a larger star burns more gas, therefore having a shorter life span).
so astronomers can definitely predict the death of stars and the times they will die.
i hope this was in some way : )

Projectile motion is a form of motion experienced by an object or projectile that is thrown near the earth's surface and moves along a curve path under the action of gravity.   

The displacement is the change in position. final position minus the initial position.the initial position at the origin is 0 m. the final position is -12 m. therefore the displacement of the object is -12 m.