Lines drawn on maps joining places With equal amount of cloud cover are called,

Step 1: Analyze the question The question asks for the name of the lines on a map that join places with an equal amount of cloud cover.

Step 2: Explain the concept In climatology and map work, "iso-" means "equal". The rest of the word tells you what is being measured:

• Isohyets: lines joining places with equal rainfall
• Isobars: lines joining places with equal atmospheric pressure
• Isonephs: lines joining places with equal cloud cover (the Greek word nephos means cloud)
• Contours: lines joining places with equal height above sea level
• Isotherms (not in the options): lines joining places with equal temperature

Step 3: Solve step by step

1. Identify the key phrase: "equal amount of cloud cover".
2. Match it to the word root: neph- means cloud, so the word is isoneph.
3. Eliminate the others: • A (isohyets) is rainfall, so it is wrong. • B (isobars) is pressure, so it is wrong. • D (contours) is height or relief, so it is wrong.

Step 4: Answer The correct option is C. isonephs.

Tip: Link each "iso" word to its root:

• hyet sounds like "wet" (rain)
• bar is for barometer (pressure)
• neph is for nephology, the study of clouds
• therm is for thermometer (temperature)