____________________ are materials and energy in nature that are essential or useful to humans

Fill in the blanks with correct word


Natural resources

Environmental & Atmospheric Sciences

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Why is calcium fluoride, CaF2, a high melting point crystalline solid, while stannic chloride, SnCl4, is a volatile liquid?

A. CaF2 is a small, linear, nonpolar molecule, while SnCl4 is a huge tetrahedral structure. Therefore, the bonds in calcium fluoride tend to give it a higher melting point temperature. B. Ionic compounds formed by elements on opposite sides of the periodic table, like CaF2, tend to have higher melting points than more covalently bonded structures, like SnCl4. C. Actually, we would predict these results to be the opposite. Since each metal is combined with a group 17 halogen, the heavier metal (tin) combination should have the higher melting point. D. There is no theory to predict the physical property of melting point. Melting point temperatures are empirically determined.

Environmental & Atmospheric Sciences

As a result of taboos against consuming pork, the number of pigs raised in different regions of the world has remained the same and even over the ages

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

All life on Earth is fundamentally the same. Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

Which type of waves are called “body waves” because they move through the interior of Earth?

a. ?P waves only b. ?S waves only c. ?surface waves only d. ?S waves and surface waves e. ?S and P waves

Environmental & Atmospheric Sciences