The ocean was mostly in place by 4 billion years ago. Indicate whether the statement is true or false
ANS: T
The ocean continues to form to this day. This is on a very small level, about 0.1 cubic kilometers per
year. Information can be found in the section Earth, Ocean, and Atmosphere Accumulated in Layers
Sorted by Density.
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Which of the following is shown as a heavy blue line with triangles?
A) dry line B) warm front C) cold front D) occluded front
Second-growth forests ________
A) in North America are mostly in British Columbia and Alaska B) are forests that establish themselves after virgin timber has been removed from an area C) are less abundant on Earth today than they were 500 years ago D) are forests whose timber has second-rate value E) are those forests in the National Parks that are protected from logging
The ________ is the most voluminous of the Earth's three major concentric zones.
A. lithosphere B. core C. mantle D. crust E. asthenosphere
The seeds of conifer trees are found in ________
A) flowers B) roots C) shoots D) cones E) tissue