According to Figure 1, which of the following state-ments best describes how the resistivity of the sandand gravel layer compares to the resistivity of the tilllayers? The resistivity measured in the sand and gravellayer is:
A.
lower than the resistivities measured in any of the till layers.
B.
higher than the resistivities measured in any of the till layers.
C.
the same as the resistivities measured in the sur-face sediments.
D.
lower than the resistivities measured in the bed-rock.