What happens to the heat that is produced from fission reactions that occur in nuclear power plants?
a. it is used to turn water into steam.
b. it is used to heat local buildings.
c. it is a waste product and is not used.
d. it is used to power nuclear fusion reactions.

a. it is used to turn water into steam.

Explanation:

In fission reaction the reaction is carried out in the reactor which is surrounded by water.

When energy is released in fission reaction it is absorbed by the water which is surrounding the reactor and then that water is converted into steam using this energy of fission

Further this steam is used to operate turbine which will convert the energy of team into electrical energy.

So in this way first of all the in this fission reaction energy is used to convert water into steam

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me