(a) Decreases

(b) Increases

(c) Stays the same

(d) Depends on the balloon material

(a) Heat the blade

(b) Cut towards yourself

(c) Always cut on a stable surface

(d) Use a dull knife

(a) Melting

(b) Evaporation

(c) Condensation

(d) Freezing

(a) Blue light from the sun reaches us directly

(b) The atmosphere scatters blue light more than other colors

(c) Our eyes are more sensitive to blue light

(d) Reflection of sunlight off water vapor

(a) Light hitting an object

(b) Vibrations travelling through a medium

(c) Electricity flowing through a circuit

(d) Heat radiating from an object

(a) Oxygen

(b) Carbon dioxide

(c) Nitrogen

(d) Helium

(a) Metal is heavier
(b) Metal is a better conductor of heat
(c) Wood is a better insulator
(d) There is no difference

(a) Metal
(b) Rubber
(c) Wood
(d) Glass

(a) Increases
(b) Decreases
(c) Stays the same
(d) Depends on the size of the tire

(a) Burning paper
(b) Boiling water
(c) Rusting iron
(d) Dissolving sugar in water