How many dollar bills are in circulation? There are approximately 11.7 billion one dollar bills in circulation in the US, with 8.9 billion 20 dollar bills and 11.5 billion 100 dollar bills. There are about 39.8 billion notes in circulation all together. For coins, there are about 28 billion in general circulation. What are some unusual notes in circulation?
Planet Earth has an abundance of water that makes it unique and perfect for life to exist. Planet Earth has an abundance of water that makes it unique and perfect for life to exist.
The earth is not made mostly of hydrogen because the earth is small (less gravity) and hydrogen is light, so the hydrogen that was here, has mostly escaped the gravitational pull of Earth. On Earth, hydrogen can be found in many places. Hydrogen combines with oxygen to form water, which is essential for life on earth. Water makes up three quarters of the earth s surface (See Fig. 4). Three quarters of our bodies are made of water. Fossil fuels are made of hydrocarbons, a combination of hydrogen and carbon.