Problem: OPTIONS:
- xerosphere
- exosphere
- ionosphere
- thermosphere
Q: Q: What is the upper-most atmosphere known as? A:
Answer: thermosphere

Problem:OPTIONS:
- hepatic liverworts
- hornworts
- kidney liverworts
- thallose liverworts

Q: What are liverworts with a flattened, ribbon-like body called? A:
****
A: thallose liverworts

Q: What makes the earth habitable for humans? A:
OPTIONS:
- carbonate of water
- aridity of water
- availability of water
- abundance of water
abundance of water

Q: What consists of four major components: inorganic mineral matter, organic matter, water and air, and living matter? A:
OPTIONS:
- nitrogen
- color
- rocks
- soil

Answer: soil

Question: Q: What color light is actually the absence of electromagnetic waves in the visible spectrum, for humans? A:
OPTIONS:
- ultraviolet light
- infrared light
- blue light
- black light
Answer: black light

input: OPTIONS:
- a lake
- a river
- a riverbank
- a waterfall Now, answer this question: Q: When a stream flows from a hard to soft rock area, what is often formed? A:
A:
output:
a waterfall