Problem:OPTIONS:
- sand dune
- desert
- oasis
- esker

Q: What is a winding ridge of sand deposited by a stream of meltwater called? A:
****
A: esker

Q: What is the region in the center back of the eye that is responsible for acute vision? A:
OPTIONS:
- cornea
- lens
- pupil
- fovea
fovea

Q: By what processes does the ocean modify landforms? A:
OPTIONS:
- splash and deposition
- shape and deposition
- sweeping and deposition
- erosion and deposition

Answer: erosion and deposition

Question: Q: Sulfate is used as a cleaning agent because it is acidic and soluble in what substance? A:
OPTIONS:
- air
- salt
- oxygen
- water
Answer: water

input with options: Q: What term is used to describe the development of new technology? A:
OPTIONS:
- variation design
- evident design
- Smart Design
- technological design
output: technological design

Problem: OPTIONS:
- irregular flow
- quick flow
- slow flow
- backflow
Q: Q: Heart valves prevent what kind of blood flow from happening in the heart? A:
Answer:
backflow