Q: Fact 1: Many corals secrete an exoskeleton that builds up to become a coral reef. Fact 2: An exoskeleton is an external framework. Given the two facts above, what do many corals secrete that build up to become a coral reef?

OPTIONS:
- an external framework
- The area was once underwater
- that material's properties
- bioaerosols
- water
- dust
- after too much water received
- oxygen

A: an external framework

Q: Fact 1: Increasing heat causes thermal expansion. Fact 2: Gaskets and thermal expansion increase the misalignment problem. Given the two facts above, misalignment problems in gaskets can be increased by:?

OPTIONS:
- mechanic
- storms
- wind
- replacement
- force
- heat
- sweat
- cracks

A: heat

Q: Fact 1: When light enters the eye through the pupil , that light falls on the retina. Fact 2: Light is made of photons . Given the two facts above, what enters the eye through the pupil and. falls on the retina to make an image?

OPTIONS:
- photons
- epidermal
- sun's heat
- our star
- energy
- an object
- sunlight
- movement

A: photons

Q: Fact 1: Most canyons are formed by flowing rivers through erosion over long periods of time. Fact 2: Canyon formed as a consequence of river erosion. Given the two facts above, what does erosion form?

OPTIONS:
- valleys
- Sediment
- mountains
- canyons
- soils
- hills
- soft soil
- loose soil

A:
canyons