A student buries an ice cube in a pan of dirt and observes the dirt as the ice cube melts. This activity is a model of the formation of a kettle.
C. the downhill flow of soil and rock resulting from gravity.
here is why... B and D don't make any sense and are not relevant to the question and A really doesnt go along with the question either.
To keep track whether or not they go extinct
Answer:
The reasons why Chinese immigrants came to escape economic chaos in China. They came to the united states to find gold during the California Gold rush which was in 1849. But when the gold rush had ended they were seeking for jobs and a lot of them started to work of the Transcontinental Railroad, which is a railroad track that goes through the whole entire country without breaking off the tracks to take a new train. Because of this they ended up making money for their poor family's.
Explanation:
Learned this in like 8th grade i think XD
Because of the volume of goods that travel to its length