Problem: OPTIONS:
- correlated compound
- isotope
- neutralized molecule
- ionic compound
Q: Q: What is an electrically neutral compound with positive and negative ions? A:
Answer: ionic compound

Problem:OPTIONS:
- gravitational field
- resistance field
- optical field
- magnetic field

Q: What is the space around the magnet called? A:
****
A: magnetic field

Q: A decline in blood flow to what organs stimulates release of the enzyme renin, in turn stimulating the reabsorption of sodium and water? A:
OPTIONS:
- thyroids
- kidneys
- lungs
- kidneys
kidneys

Q: In which sphere of the atmosphere do the northern and southern lights occur? A:
OPTIONS:
- lithosphere
- stratosphere
- ionosphere
- thermosphere

Answer: thermosphere

Question: Q: What term refers to any method of removing carbon dioxide from the atmosphere and storing it in another form? A:
OPTIONS:
- carbon footprint
- carbon metamorphosis
- carbon transfer
- carbon sequestration
Answer: carbon sequestration

input: OPTIONS:
- cell phones
- wireless networks
- radios
- the sun Now, answer this question: Q: What is the most important source of electromagnetic waves on earth? A:
A:
output:
the sun