Question

worm grunting - also known as worm charming or worm fiddling - is a practice used to bring earthworms up to the surface of the ground. some worm grunters pound a wooden rod into the ground, and then rub a metal strip across the rod. this makes a sound thats been described as a cross between a rundown door creaking and a bullfrog with a sore throat. some grunters put a running chainsaw into the ground. others use knitting needles or pitchfork tines. and some worm grunters put on a show - by strapping on a pair of tap shoes and dancing to drive worms to the surface.
but its not the sound resonating through the air that beckons the earthworms out of the soils damp darkness. its the vibrations created by the instruments the worm grunters use. the vibrations mimic those made by moles moving underground. these subterranean mammals eat earthworms. so, to avoid becoming a mole meal, the worms quickly flee to the surface, where they are easily scooped up by humans instead.
on a typical morning, professional charmers may collect about 4,000 earthworms. the worms are then sorted into buckets of 50 and sold for $15 each for fishing bait. but worm grunting doesnt just pay the bills - its also an excuse for recreational activities. worm grunting festivals take place in the united states, canada, and the united kingdom. these festivals celebrate the recreational but reliable practice of calling for earthworms to rise from their underground habitats. and these events get competitive, pitting
question 4
what cause - and - effect relationship is described in this article?
a. when vibrations run through the soil, earthworms flee to the surface.
b. when dance music floats through the air, earthworms flee to the surface.
c. when the sound of chainsaws cuts through the air, earthworms flee underground.
d. when wooden rods are pounded into the soil, earthworms flee underground.

Explanation:

The article discusses how vibrations (cause) make earthworms flee to the surface (effect). For example, when wooden rods are pounded (vibration - cause), earthworms come to the surface (effect). This shows a cause - and - effect relationship where vibrations (from different sources like pounding rods, chainsaws etc.) lead earthworms to move.

Answer:

A. When vibrations run through the soil, earthworms flee to the surface.