Earth's Structure
ICSE · Class 9 · Geography
Flashcards for Earth's Structure — ICSE Class 9 Geography. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWhat are the three main parts of the Earth?
Answer
Earth is composed of three parts: crust, mantle, and core. These layers differ in thickness, composition, temperature, pressure, and density.
What is the crust of the Earth?
Answer
The crust is the outermost layer of the Earth. It is about 6 to 48 km thick, and the glossary also gives a thickness range of 5 to 60 km. It is the thin upper shell made of rock.
What does the word Lithosphere mean?
Answer
Lithosphere is the name used for the crust. The word comes from the Greek word Lithos, meaning rock. It refers to the Earth’s outer rocky layer.
What are Sial and Sima?
Answer
Sial is the upper or continental layer of the crust, made mainly of silica and aluminium. Sima is the lower continuous layer of the crust, made mainly of silica and magnesium.
Why is the continental layer called Sial?
Answer
It is called Sial because silica and aluminium are the main materials present in it. Its composition is like granite, and its density is about 2.7.
Why is the lower crust layer called Sima?
Answer
It is called Sima because silica and magnesium are the main materials present in it. Its composition is similar to basalt, and its density is about 2.95.
How do Sial and Sima differ?
Answer
Sial is the upper, discontinuous, lighter layer of the crust, while Sima is the lower, continuous, heavier layer. Sial has density about 2.7, while Sima has density about 2.95. Sial is like granite, a…
What is the importance of the crust under continents and oceans?
Answer
In continental areas, the granitic and basaltic layers together reach about 45 to 48 km thickness. Under the ocean floor, the basaltic layer is the thinnest part of the crust. The crust is thickest be…
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