What is the reason that the presence of Glossopteris flora fossils was strong evidence for the existence
of Gondwana? What will be an ideal response?
The seeds of the Glossopteris ferns could not have been carried long distances by wind or water, so the
plants must have lived on adjacent lands.
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Each year the U.S. spends over ________ billion dollars on imported oil.
A. 400 B. 100 C. 200 D. 800
When freshwater inflows into estuaries are reduced,
A) salt water intrudes into the system. B) freshwater species of plants and invertebrates may invade the estuary. C) populations of native species increase. D) freshwater enters marine ecosystems, causing loss of coastal biodiversity.
Which of the following has the highest permeability?
A. gravel B. sandstone C. sand D. conglomerate
Placement of impermeable materials below a landfill may, in wet climates, lead to excess accumulation of leachate and eventual overflow from the site.
Answer the following statement true (T) or false (F)