Removal of ________ will always result in the greatest changes in an ecological system.
Fill in the blank(s) with the appropriate word(s).
Answer: a keystone species
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In which direction is the storm as a whole moving?
The question is based on this hypothetical weather map in the Northern Hemisphere showing isobars and the positions of a cold front and a warm front (top of map is north). Six locations are marked on the map (points A, B, C, D, E, and F). A cross-section diagram along points A, B, C, D, E, and F is shown below the map.
Which of the numbered features is a pyroclastic flow?
A. 1 B. 2 C. 3 D. 4 E. 5
The mantle can be separated into two different portions-the lower mantle and the upper mantle. The lower mantle is
A. composed of putty that flows like molasses. B. predominantly liquid. C. rigid and cannot flow. D. completely solid due to extreme pressure that prevents rocks from melting.
________________________ ________________________ are former water gaps where streams no longer flow. What will be an ideal response?