Q: Besides the uppermost mantle, what else is the lithosphere composed of? Choices: - surface - outer core - inner core - crust A:
crust

Q: A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures? Choices: - niacin - vitamin A - vitamin C - vitamin d A:
vitamin d

Q: Q: The hemisphere that is tilted away from the sun is cooler because it receives less what? Choices: - direct electrons - x-rays - pollution - direct rays A:
A: direct rays

Question: Q: Since the electric field lines point radially away from the charge, they are perpendicular to what? Choices: - singularity lines - archetypical lines - magnetic field lines - equipotential lines A:
Answer: equipotential lines

*Question*
Q: When a wave travels down a string, the string vibrates up and down at right angles to the wave's what? Choices: - frequency - pressure - gravity - direction A:
**Answer**
direction

Q: Q: What is magnetism produced by an electrical current? Choices: - strong magnetism - hydromagnetism - exomagnetism - electromagnetism A:
A: electromagnetism