What is sound energy? A. A wave transmitted by the vibration of particles bumping into each other.
B. Energy stored in the chemical bonds between atoms.
C. A wave of photons carry the energy.
D. Transfer of energy from waves to particles.

This graph gives information on changes in sea ice extent in the arctic ocean over a 30-year span. the overall trend shows in the ice extent. to address the trend, scientists need to ask themselves, one direct consequence of the trend is that

What forms when chemical reactions combine pollution with sunlight?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.