Topic – Part of static series under the heading – “ Earth’s lithosphere and rocks”
6) Explain the three major groups of rocks along with their sub types which are found in Earth’s lithosphere?(250 words)
GC Leong – Ch2: Earth’s crust
Key demand of the question
The question is straightforward in its demand. It expects us to explain the major categories of rocks along with their subtypes. We need to explain the formation, origin, characteristics and subtypes of these rocks.
Structure of the answer
Introduction – Explain that earth is made up of different types of rocks, each different from the other.
Body – Explain the origin, formation and characteristics of Igneous rocks along with its subtypes – Plutonic and Volcanic; sedimentary rocks and its subtypes – mechanically, organically and chemically formed sedimentary rocks and metamorphic rocks. Give examples for each.