Wind energy is gaining support as a possible energy source for people. what is the source of the energy that generates wind?
a) the energy comes from the oceans.
b) the energy comes from seismic activity and volcanoes.
c) the energy comes from the sun as it heats up the earth.
d) the energy comes from heat and pressure deep inside the earth.

Noble gases are the most reactive elements on the periodic table. a. true b. false

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

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.