A cinder cone or scoria cone is a steep conical hill of loose pyroclastic fragments, such as either volcanic clinkers, cinders, volcanic ash, or scoria that has been built around a volcanic vent. They consist of loose pyroclastic debris formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as either cinders, clinkers, or scoria around the vent to form a cone that often is symmetrical; with slopes between 30–40°; and a nearly circular ground plan. Most cinder cones have a bowl-shaped crater at the summit.
Answer C.
San Francisco, CA, is approximately 800 miles from Seattle, WA.
<span>(A)SPIT
Spit also known as sand spit is a stretch of beach or sand built up that projects into the water. Spits are caused by wind blowing at an angle to the coastline, resulting in long-shore drift. The material moved during long-shore drift becomes deposited therefore causing a spit.</span>
I say true most of them would be informal
The Negro and Madeira Rivers feed into the Amazon.
