Elston attached a spring scale to a box and pulls in across the floor. he then placed a book and pulls it in the same distance with the same effort. how does the force change after the book is placed in the box a. it will decrease
b. it could increase or decrease depending on the weight of the book.
c. it will increase
d. it could increase or decrease depending on the weight of the box.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

grav potential energy

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.