Heat is transferred in a gas through

friction
conduction
convection
radiation

Which of these questions might a character ask if the conflict is man versus self? a. which path should i take to better myself? b. which boulder will be too heavy for me to carry? c. which friend is going to ditch me today? d. all of the above

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

What was the first instrument to ever record an earthquake?