Fires that burn ahead of the main fire are known as _______________ fires

Fill in the blank with correct word.


ANSWER: spot

Environmental & Atmospheric Sciences

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The form of nitrogen that comprises 78% of atmospheric mass and is necessary for biological processes, but is unusable by plants, is

A) N2. B) NOx. C) N2O. D) NO2.

Environmental & Atmospheric Sciences

The cassava is an important food crop for people living in sub-Saharan Africa. In the 1970s, mealybug infestations destroyed harvests and people starved

A researcher who studied the mealybug in its native environment discovered a parasitoid wasp that was a natural predator. After extensive testing to determine safety, the parasitoid wasp was introduced into the sub-Saharan region with tremendous effect controlling the mealybug throughout most of Africa. This approach represented a form of A) cultural control. B) natural enemies control. C) genetic control. D) natural chemical control.

Environmental & Atmospheric Sciences

____________________ is a way to grow food on steep slopes or mountainsides without depleting topsoil

Fill in the blanks with correct word

Environmental & Atmospheric Sciences

Which of the following would be an ion with a double positive charge?

A) an Mg atom that gains two electrons B) an Mg atom that gains one electron C) an Mg atom that loses two electrons D) an Mg atom that loses one electron E) none of the above

Environmental & Atmospheric Sciences