Water is a very reactive chemical compound. Explain how chemical ...

[Pineapplelove6]

Water is a very reactive chemical compound. Explain how chemical reactions between ground water and minerals affect drinking-water quality, rock formation, mineral-resource formation, and development of landscapes.
 
  In this short essay, explain why ground-water chemistry tends to be very different from surface-water chemistry.
  What will be an ideal response?

Question 2

What are the two main types of sedimentary deposits formed near or beneath modern glaciers? How would you distinguish these two deposits types in an area that was glaciated in the past?
 
  What will be an ideal response?

[aliotak]

Answer to Question 1

Ground-water chemistry tends to be different from surface-water chemistry because ground water that flows slowly underground interacts with the minerals in the aquifer materials. Ions release into the water where minerals dissolve. Changes in ground-water chemistry, temperature, or both cause mineral precipitation that cements sedimentary rocks, clogs water pipes, and forms some economically important mineral deposits of lead and zinc. Karst topography forms where ground water dissolves minerals in limestone and evaporite. Dissolution opens up spaces beneath the surface, including caverns, and causes the collapse of depressions, called sinkholes, that may capture surface drainage and make it flow underground.

Answer to Question 2

Till is the sediment deposited directly by glaciers, whereas outwash is the sediment carried away from the glaciers by meltwater streams. Till consists of a very poorly sorted, unbedded mixture of rock debris in which most of the larger cobbles and boulder are angular, scratched, and may exhibit planar, faceted surfaces. Outwash is better sorted than till, and contains bedding and cross bedding typical of river-deposited sediment. Cobbles and boulders in outwash are rounded.