Which is a major drawback to the use of hydrogen power?
A. The use of fossil fuels is required to create pure hydrogen.
B. Hydrogen may run out in the next 100 years.
C. Burning hydrogen releases greenhouse gases.
D. Hydrogen power creates toxic waste that must be stored forever.

Which is the first surface that has the potential to come into contact with solar radiation? a. icebergsb. cloudsc. the oceand. land

Based on this map, which statement about africa’s economic activity is most accurate? a) coastal countries are all members of opec b) economic development is more common with opec nations c) coastal countries have more access to productive resources d) economic development is more common above the sahara desert

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.