Question Q.7GS1GS2
Describe the nature and mode of origin of the main types of rock at the earth's crust. (10 marks, 150 words)
Main Body
Earth crust has three major types of rocks - Igneous, sedimentary and Metamorphic.
[Origin of Main types of Rocks]
Igneous RocksOrigin from magma and lava.the lava can be (acidic) or (basic) - define the characteristic of a rock.(a) Acidic - granite, syenite. Basic - Basalt.rock can be intrusive (forms inward the crust) or extrusive (cooling outside earth (ex Basalt))
Sedimentaryformed after igneous rock undergoes chemical or organic transformations.occurs with fossilsin layers (bending).
Metamorphicformed by dynamic or contact forced in the igneous/sedimentary rocksresult of thermal or pressure situation.characteristics include foliation, banding. (2) Slate, Schist, Marble.
These rocks depict a cyclical nature in form of (ROCK CYCLE)
125 words6 paragraphs
Examiner score
1.53/10Open original scan
Page 15
Topper
DIVYA
AIR 1822025
Subject & Paper
GS1GS2
Topic
Geography - Geology
Rock Types and Formation
Types of Rocks and Rock Origin
Writing Stats
125
Total words
6
Paragraphs
descriptive-explanatory
Tone