According to paragraph 2, what is the relationship between permeability and
porosity?
A The more pores a rock has, the higher its porosity but the lower its
permeability.
B Rocks with many internal spaces that are not connected with each other will
have high porosity but low permeability.
C If water flows through a rock easily, it has high permeability but low
porosity.
D Rocks that have high permeability have high porosity and vice versa.
答案是B
雖然答對了，但感覺B還是跟文意有出入...
出自這段:
Groundwater is stored in a variety of rock types. A groundwater reservoir
from which water can be extracted is called an aquifer. We can effectively
think of an aquifer as a deposit of water. Extraction of water depends on two
properties of the aquifer: porosity and permeability. Between sediment grains
are spaces that can be filled with water. This pore space is known as
porosity and is expressed as a percentage of the total rock volume. Porosity
is important for water-storage capacity, but for water to flow through rocks,
the pore spaces must be connected. The ability of water, or other fluids, to
flow through the interconnected pore spaces in rocks is termed permeability.
In the intergranular spaces of rocks, however, fluid must flow around and
between grains in a tortuous path; this winding path causes a resistance to
flow. The rate at which the flowing water overcomes this resistance is
related to the permeability of rock.