Most air pollution results from
a)the burning of fossil fuels
b)nuclear energy use
c)volcanic eruptions
d)the evaporation of chemicals such as paints and dry-cleaning fluid

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

Me brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula.5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects.8. describe the planets’ orbits around the sun.9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets.13. what causes the seasons?

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian