Fact 1: Ice wedging is when ice causes rocks to crack by expanding in openings. Fact 2: Ice wedging is extremely effective in a moist but cold climate. Given the two facts above, what causes rocks to crack from ice expanding into openings?
OPTIONS:
- evaporation
- In the winter
- tropical climates
- heat energy
- hot, dry climates
- moist, cold climates
- colder weather
- Inches or fractions of inches.

Answer: moist, cold climates

Fact 1: Air pollution harms the respiratory and circulatory systems. Fact 2: Air pollution is caused by lots of different pollutants. Given the two facts above, what systems are pollutants bad for?
OPTIONS:
- destroying life
- classification system
- an organism's body
- respiratory and circulatory
- animal habitats
- ambulatory systems
- social security system
- the environment

Answer: respiratory and circulatory

Fact 1: Ablack hole is formed by a high-mass star collapses. Fact 2: Black Holes Black holes are the inevitable conclusion of Einstein's General Theory of Relativity. Given the two facts above, when do stars fulfill the inevitable conclusion of Einstein's General Theory of Relativity?
OPTIONS:
- inactive
- Winter
- an object
- observe it
- collapse
- light
- our star
- ligt

Answer:
collapse