Which of the followings is not true?
a. water levels in aquifers can change due to groundwater extraction.
b. around clusters of pumping wells, cone of depression can be miles in extent.
c.. drawdown is the decline in water level at a well relative to initial water level
d. groundwater divide is funnel-shape zone of water-level decline around a well that occurs due to pumping.

d) Groundwater divide is funnel-shape zone of water-level decline around a well that occurs due to pumping.

Explanation: Groundwater divide is known as the the boundary that gets formed in between the two water basins that is found at some point (usually high).It specifies the water boundary of different groundwater bodies.

The factor that divides the water in streams in a shape of a funnel is known as watershed.It comes into action when there is rainy condition and the water falls on the uneven surface of land and mountains and thus gets splited in to streams of groundwater .So, option(d) is not true statement.

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;