Q: Fact 1: Ablack hole is formed by a high-mass star collapses. Fact 2: Then, gravity collapses the star. Given the two facts above, what is the initial cause of black holes?

OPTIONS:
- energy
- gravity
- heat
- photons
- mechanical
- sun's heat
- cracking
- Smoking

A: gravity

Q: Fact 1: Erosion causes a river to become deeper and wider. Fact 2: Fertile topsoil is then lost in erosion. Given the two facts above, deepening rivers cause?

OPTIONS:
- relocation
- the loss of topsoil
- Plant growth is reduced
- to move people
- Physical weathering
- forest is destroyed
- Water expanding
- water conservation

A: the loss of topsoil

Q: Fact 1: If something is outside during the day then that something will receive sunlight. Fact 2: Another source of vitamin D is sunlight. Given the two facts above, what is a health benefit you receive for being outside?

OPTIONS:
- Relieve pain
- staying warm
- exercise
- inactive
- vitamin D
- air cools
- layers of fat
- sweating

A: vitamin D

Q: Fact 1: High temperatures can cause an object to combust. Fact 2: Dioxins are the byproducts of combustion processes. Given the two facts above, what can high temperatures cause?

OPTIONS:
- symptoms
- dioxins
- Rise
- Pollution
- anemia
- Allergies
- disease
- sweating

A:
dioxins