The presence of till indicates
A) deposition by a glacier only.
B) deposition by wind only.
C) deposition by water only.
D) deposition by both water or wind.
E) deposition by water, wind, or glaciers.
Question 2
Plants are important to the development of karst formation primarily because
A) they provide the calcium carbonate necessary for karst topography to form.
B) they lessen the impact of raindrops on the surface so the water can more rapidly flow into stream channels.
C) the decay of large roots below the surface produces cavities which eventually enlarge to form caves.
D) they supply organic acids that enhance the dissolution process.
E) openings adjacent to their roots serve as microchannels that allow water to enter the rock.
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S
Jeff Wall, A Sudden Gust of Wind (After Hokusai).
Global Pressure Systems and Wind Patterns
Wind
Measuring Wind
The response of the lac operon in the presence of lactose in a cell bearing the IS mutation