What are the main chemical components of the Sun?
A. Helium and oxygen
B. Hydrogen and oxygen
C. Hydrogen and helium
D. None of these choices are correct
Answer: C
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Minerals that do not contain silicon are classified as
A. silicates. B. clays. C. mafic. D. nonsilicates.
The higher the UV Index, the faster a person will sunburn
Indicate whether the statement is true or false
What is meant by the tragedy of the commons?
A. Common societies are disconnected from the natural environment. B. Environmental problems are very common in nature. C. Common people go through tragic environmental problems. D. The self-interest of people results in the destruction of a common or shared resource.
The extensive Australian grasslands support tens of millions of domesticated animals which account for up to one-fifth of the world's __________________.
What will be an ideal response?