What is an anthropogenic landscape? A) a pristine, natural ...

[Redwolflake15]

What is an anthropogenic landscape?
 
  A) a pristine, natural landscape in its original state
  B) a landscape that anthropologists have studied extensively
  C) a landscape that has been heavily transformed by human activities
  D) a steppe-like landscape
  E) a landscape that bears an uncanny resemblance to an anthropod

Question 2

Limestone (carbonate) weathering does not lead to the net removal of carbon dioxide from the atmosphere. Why not?
 
  What will be an ideal response?

[Kjones0604]

Answer to Question 1

C

Answer to Question 2

Because when we combine the equations for carbonate weathering for CaCO3 and precipitation to determine the net effects of these processes on the chemistry of the oceans and on the composition of the atmosphere, we have got no net removal of carbon dioxide from the atmosphere. The net effect of CaCO3 weathering on land and CaCO3 precipitation in the ocean is zero, because the two processes balance each other:

Carbonate weathering:
CaCO3 + H2CO3  Ca2+ +2HCO3 -

Carbonate precipitation:
Ca2+ +2HCO3 -  CaCO3 + H2CO3

Net result: 0

The weathering equation is the reverse of the precipitation equation.

[Redwolflake15]

Wow, this really help

[yeungji]

Thanks for the timely response, appreciate it