A. The hemisphere of the Earth is tilted more toward the Sun.
1.The presence of valves 2.the milking action of skeletal muscles 3. the veins as the muscles contract
Answer: Heat and pressure compress the mud and carbon over millions of years, forming sedimentary rock such as shale. ... The heated rock recombines into silicate minerals, releasing carbon dioxide. When volcanoes erupt, they vent the gas to the atmosphere and cover the land with fresh silicate rock to begin the cycle again.
Explanation: