input: OPTIONS:
- active
- gravitational
- reactive
- covalent Now, answer this question: Q: What type of bonds are the attractive forces between the positively charged nuclei of the bonded atoms and one or more pairs of electrons that are located between the atoms? A:
A:
output: covalent

Q: Scientists found that the youngest rocks on the seafloor were where? A:

OPTIONS:
- trenches.
- mid - ocean sediments
- mid - ocean glaciers
- mid-ocean ridges

Answer: mid-ocean ridges

Problem: OPTIONS:
- ozone layer
- thermosphere
- ionosphere
- exosphere
Q: Q: Molecules of gas are rare in what outermost region of the planet's atmosphere? A:
Answer: exosphere

Problem:OPTIONS:
- heating
- dissolution
- liquid reactions
- chemical reactions

Q: Pure substances have a constant composition and can only be changed through what? A:
****
A: chemical reactions

Q: The angle of refraction depends on the index of what? A:
OPTIONS:
- frequency
- vibration
- reflection
- refraction
refraction

Q: What is the transfer of thermal energy by waves that can travel through empty space called? A:
OPTIONS:
- convection
- induction
- vibration
- radiation

Answer:
radiation