Mountain chains can be formed by the collision of two tectonic plates. Which of the following provides the energy which pushes the tectonic plates together? A) energy from the Earth's interior energy from the Earth's interior
B) energy from ocean currents energy from ocean currents
c) energy from sunlight energy from sunlight
D) energy from organisms living on the Earth

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 statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.