Identify a substance that is 140g and has a volume of 20ml by first calculating

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b.colder climates near the equator c.large waves on the cost of europe d.warm climates in northern europe

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?