The friction between the two objects creates heat.
Background research is used to familiarize yourself with the topic or problem you're conducting your experiment on and help you form an educated guess explaining or solving it that will become your hypothesis.
Answers
1. cumulus ⇒ b. look like pieces of cotton in the sky
2. altostratus ⇒ c. resembles an overcast sky; layers of gray or white clouds
3. cirrus ⇒ a. look like wispy feathers high in the sky
4. nimbostratus ⇒ E.dark, thick-layered clouds; rain's coming
5. fog ⇒ d. clouds nearest Earth's surface
The answer is <span>nitrogen triodide
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