A gardener starts a compost pile. He adds dead leaves, lawn clippings, and other organic matter to the pile. After a few weeks, the gardener notices that materials in the pile have turned brown and soft. The compost pile also feels warm both during the day and at night. Which of the following statements is the best explanation for this?
A. Wind is causing the materials in the pile to rub together, and this generates heat from friction.
B. Wild animals are using the compost pile as a nest, and their body heat is warming the pile.
C. Soil from the ground has moved up through the compost pile, which makes the pile denser and warmer.
D. Decomposers are breaking down materials in the compost pile, which causes heat energy to be released.

they dont have any evidence

measuring physical properties lab reportinstructions: in the physical properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in tiny world. record your observations and test measurements in the lab report below. youwill submit your completed report.name and title: lyric lawton, mr.herbert, 10/13/17, physical properties lab. objective(s): i need to parvus build his house out of the right material, so he will stay cool in the mountains.hypothesis: if we use wood to build the roof of the house, then the temperature inside the house will remain cooler.if we use clay brick to build the walls and floors of the house, then the temperature inside the house will remain cooler.if we use aluminium to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.if we use iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure.