[ 31 ] Earth and Space Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • What is the correct order of the following steps in the carbon cycle? • These organisms release carbon dioxide back into the atmosphere when they breathe. • Plants convert carbon dioxide to sugars through photosynthesis. • Plants remove carbon dioxide from the atmosphere. • Bicarbonate ions (HCO 3 – ) settle on the ocean floor and form sedimentary rock. • The sugar in plants enters the food chain, first reaching herbivores, then carnivores, and finally scavengers and decomposers. Which of the following statements is NOT true about fossil fuels? A. Fossil fuels come from the carbon of organisms that lived millions of years ago. B. Burning fossil fuel releases energy, which is why these fuels are used to power machines. C. When fossil fuels burn, carbon dioxide is released into the atmosphere and causes global warming. D. Fossil fuels are one of the main renewable resources in our environment. Select the best answer to fill the blank from the choices that follow. Since the Industrial Revolution, when the consumption of energy to power machinery began to substantially expand, people have increased the concentration of carbon dioxide in the atmosphere by _________ by burning fossil fuels and cutting down forests that absorb carbon dioxide. • 10% • 30% • 50% • 70%