The formation of ____ begins when ultraviolet radiation (at wavelengths of about 0.31 µm and below) dissociates some of the ozone into molecular oxygen and atomic oxygen
a. water vapor
b. the hydroxyl radical (OH)
c. sulfur dioxide
d. acid rain
e. dry deposition
ANSWER: b
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Which statement regarding human evolution and our hominid relatives is false?
A) In some hominids, males were significantly larger than females in body size. B) Homo erectus was the first species to migrate out of Africa and into Europe and Asia. C) Neanderthals interbred with modern humans, but disappeared as modern humans spread. D) Modern human anatomy appeared at the same time as modern human cultural traits.
Sedimentary rocks made up of alternating thin layers of chert and iron minerals, mostly the iron
oxides hematite and magnetite; these deposits are ore minerals from which iron is extracted:a. banded iron formations (BIFs) d. evaporites b. limestones e. blue-green algae c. sand dunes
Which of the following is not a branch of the Indo-European family?
A) Indo-Iranian B) Germanic C) Balto-Slavic D) Romance E) Dravidian
Seedless vascular plants evolved which of the following features of modern plants?
A)seeds only B)roots only C)leaves only D)secondary growth only E)roots, leaves, and secondary growth