A presidential system that is a constitutional, federal republic
Answer: It is Molten Rock.
Explanation:
Natural gas accounts for the most used source of energy in the usa. natural gas is used in homes, and to generate electricity. according to research, 37 percent of energy consumption in the USA is from this form of primary energy.
it is followed by oil,coal and nuclear energy. Wood is a rare source of energy in the country. Renewable sources of energy include solar and wind energy.
The answer to your question is: Scientists from around the world need a way to share data they can all understand
