Which of the following is true?
A) The number of species existing at one time has decreased throughout history.
B) Extinctions of past species have always happened gradually and on a small scale.
C) Bacteria represent a newer form of life, not present during the early prehistory of Earth.
D) Species on Earth today are but a fraction of all species that ever lived.
E) Most organisms present early in Earth's prehistory were more complex than modern organisms.
D
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Spits and baymouth bars are formed due to ____________________ currents. Fill in the blank(s) with the appropriate word(s)
One of the most general conclusions to be drawn from plate tectonic theory is that ____.
a. the Earth is gradually losing heat b. the Earth's geography has continually changed c. the Earth is slowly expanding d. the Earth is slowly shrinking e. all the ocean basins are gradually enlarging
________ generally constitutes the highest percentage of the annual sediment load moved by a stream
A) Bed load B) Saltation load C) Dissolved load D) Suspended load
Deep ocean trenches are associated with ________
A) rift valleys B) subduction zones C) submarine canyons D) transform faults E) turbidity currents