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

The lines drawn on maps joining places with equal amounts of cloud cover are called isonephs. Isonephs are similar to isobars and isohyets, which are lines joining places with equal air pressure and equal rainfall, respectively. Isonephs join places with equal cloud cover, meaning that they connect points on a map that have received the same amount of cloud cover. Isonephs are used in meteorology to display cloud coverage data and can help forecasters to predict weather patterns and atmospheric conditions. These lines are usually drawn using a particular interval or step, such as every 10% or 20% of cloud cover. Therefore, the correct answer to the question is isonephs.