KIDS TRIVIA

Detailed explanation-1: -Pumice is pyroclastic igneous rock that was almost completely liquid at the moment of effusion and was so rapidly cooled that there was no time for it to crystallize. When it solidified, the vapours dissolved in it were suddenly released, the whole mass swelling up into a froth that immediately consolidated.

Detailed explanation-2: -Pumice is a fine-grained volcanic rock. It is very light grey to medium grey in colour. It contains a lot of empty gas bubbles, so it is very light and looks rather like a sponge. Sometimes pumice is so light that it will float on water.

Detailed explanation-3: -There are two basic types: 1) intrusive igneous rocks such as diorite, gabbro, granite and pegmatite that solidify below the Earth’s surface; and 2) extrusive igneous rocks such as andesite, basalt, obsidian, pumice, rhyolite and scoria that solidify on or above the Earth’s surface.

Detailed explanation-4: -Option D) Igneous rocks – Pumice stone is the type of igneous rock. Igneous rock and these rocks are formed when hot, molten rock crystallizes and solidifies and when this rock solidifies or hardens, a very light stone is formed with tiny bubbles of gas. Thus, this option is the correct answer.