Question

1. which of the following is the best example of conduction?

a) the sun warming earths surface
b) warm air rising in a room
c) a metal spoon heating up in a pot of soup
d) cold ocean water sinking

1. when mixing warm and cool water, the final temperature is

a) higher than both initial temperatures
b) lower than both initial temperatures
c) between the two initial temperatures
d) unpredictable

1. a student heats water samples of different volumes to observe temperature change per minute. the dependent variable is:

a) starting temperature
b) volume of the water
c) time of heating
d) temperature change per minute

1. a berm placed underwater near a glacier reduces melting by

a) cooling the air
b) blocking warm salty water
c) increasing albedo
d) absorbing co₂

1. in energy transfer models, arrows typically represent

a) mass
b) temperature
c) volume
d) energy flow

1. a positive feedback loop is best described as a process that

a) stabilizes a system
b) opposes the original change
c) amplifies the original change
d) requires no energy transfer

1. worldwide lightning maps show that lightning is most common in regions that are:

a) cold and dry
b) warm and moist
c) high in elevation
d) near the poles

Explanation:

Question 14

Conduction is heat transfer through direct contact. Option A is radiation (Sun to Earth), B and D are convection (fluid movement). A metal spoon in soup gets heat via direct contact (conduction).

When mixing warm and cool water, heat transfers until thermal equilibrium. The final temp is between the two initial temps (warmer cools, cooler warms).

Dependent variable is what’s measured. The experiment measures temperature change per minute (dependent), while volume (independent) is manipulated. Starting temp and time are controlled variables.

Answer:

C. A metal spoon heating up in a pot of soup

Question 15