In old times, before there were train signals, people who worked on the railroad would often put their ear down to the train track to listen for an oncoming train. why would this result in hearing the train further off than just listening for the train through the air? question options: people did not do this because sound travels faster through less dense material, like air, rather than more dense materiel, like train tracks. sound travels slower, but louder through solid material because it is more dense, so the train could be heard better this way. sound travels slower in air because there are often trees and other items blocking the sound. sound waves travel faster in more dense material, and the more dense the material the louder the sound is.

(04.05 hc) analyze the given diagram of the carbon cycle below. an image of carbon cycle is shown. the sun, a cloud, two trees, one on the left and the other on the right, an animal, lake, and a factory are shown in the image. an arrow is shown from the sun towards the left tree marked a. the sun is marked b. there is an arrow from the air above the clouds, marked c, towards the left tree. an arrow from a location close to the ground marked d points towards dead organisms, which is a label under the animal. an arrow marked e points from the right tree straight up to the clouds. an arrow marked f points from the animal straight up to the clouds. an arrow marked g points from the factory towards the air above the clouds, c. there is an arrow pointing from the air to the lake labeled carbonates in water, an arrow pointing down from dead organisms to fossils and fossil fuels, and an arrow from fossils to the factory. part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer.