Crust Composition and Characteristics of Earth’s Surface Layers

The video tutorial by Shri Hari sir provides an overview of the earth's crust, explaining its two main types: continental and oceanic. The continental crust, also known as Sial, is composed mainly of silica and aluminum, while the oceanic crust, known as Saima, consists of silica and magnesium. The video discusses the density and thickness differences between the two crust types, with continental crust being thicker and less dense than oceanic crust. Additionally, the types of rocks found in each crust are covered, with granite prevalent in continental crust and basalt and gabbro in oceanic crust.

What is the outermost layer of the Earth's surface called?

• Crust

• Lithosphere

• Core

• Mantle

Which type of crust is primarily found under large landmasses?

• Oceanic crust

• Continental crust

• Core

• Mantle

What elements primarily compose the continental crust?

• Silica and Magnesium

• Iron and Nickel

• Carbon and Oxygen

• Silica and Aluminum

What is the density range of the oceanic crust?

• 2.65 to 2.90 cubic grams

• 3.5 to 4.0 cubic grams

• 1.0 to 1.5 cubic grams

• 2.9 to 3.3 cubic grams

What is the oceanic crust primarily composed of?

• Silica and Aluminum

• Silica and Magnesium

• Carbon and Oxygen

• Iron and Nickel

What is another name for the continental crust based on its composition?

• Sial

• Asthenosphere

• Sima

• Lithosphere

What is the approximate thickness of the continental crust?

• 20 to 25 km

• 5 to 10 km

• 50 km

• 30 km

Which type of crust is generally thinner?

• Continental crust

• Core

• Oceanic crust

• Mantle

Which type of rock is predominantly found in the continental crust?

• Granite

• Basalt

• Gabbro

• Limestone

Which type of rock is commonly found in the oceanic crust?

• Marble

• Sandstone

• Basalt

• Granite