5. What are the differences from nuclear fusion and nuclear fission from specific examples?6. How was the earth created based upon the gases?7. What is the actual shape of the earth?10. What is the definition of aphelion? What is the definition perihelion? Be sure to know the differences from specific examples.17. What is the defintiion of remote sensing?18. What is definition of multispectral or multiband spectrums for satellites?21. How many wavelengths are present for the Landsat satellites? Which bands are utilized to show the true colors of the Earth?