I think the answer is A. subsistence agriculture.<span />
Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone.
Formed from a valcano have a nice day!
Answer:
8-10 hrs
Explanation:
The National Sleep Foundation says on its website, "Teens need about 8 to 10 hours of sleep each night to function best. Most teens do not get enough sleep — one study found that only 15% reported sleeping 8 1/2 hours on school nights."
