Problem: OPTIONS:
- alto clouds
- nebulous clouds
- silicic clouds
- noctilucent clouds
Q: Q: What are the highest clouds in the atmosphere? A:
Answer: noctilucent clouds

Problem:OPTIONS:
- astronomy
- physics
- chemistry
- geology

Q: What is the name of the scientific field that deals with the general study of the solid earth? A:
****
A: geology

Q: When two of these meet, the result is often a storm? A:
OPTIONS:
- air pockets
- electromagnetic waves
- tectonic plates
- air masses
air masses

Q: What is the length of the route between two points? A:
OPTIONS:
- speed
- direction
- velocity
- distance

Answer: distance

Question: Q: What is the term for a mixture of two or more substances that has the same composition throughout? A:
OPTIONS:
- fluid
- simple liquid
- structure
- solution
Answer: solution

input: OPTIONS:
- neutral compounds
- zero charged compunds
- zeronic ions
- ionic compounds Now, answer this question: Q: What kind of compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero? A:
A:
output:
ionic compounds