Q. What is the second most abundant element on Earth's crust?
Answer: Silicon
Notes: Silicon is the second most common element present in the crust after Oxygen. It exists as a compound in the mantle and the crust. In the crust, it exists combined with oxygen to form silicate minerals. It is found in the sand which is an abundant and easily accessible resource on Earth. Silicon is also recovered from quartzite, mica, and talc.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 231 in Geology - Rocks, Plate Tectonics, Earthquakes, Volcanoes in above course in App.