From chapter - structure of earth .
Q1.How does earth behave as a magnet ?
Q2.Which layer of earth's layer is constituent of radioactive materials?
Q3.What is the composition of mantle ? Explain briefly.
Answers
Answer:
Answer 1
Earth itself behaves like a huge bar magnet with its magnetic poles near the geographical north and south poles. ... Therefore, when a magnet issuspended freely, the magnetic poles of the earth attract the opposite poles of the magnet and the magnet comes to rest in the north-south direction.
Answer 2
The solid inner core rotates within the liquid outer core. This giant ball of rotating solid iron and nickel generates the Earth's magnetic field. The core is also the Earth's source of internal heat because it contains radioactive materials that release heat as they break down into more stable substances.
Answer 3
In terms of its constituent elements, themantle is made up of 44.8% oxygen, 21.5% silicon, and 22.8% magnesium. There's also iron, aluminum, calcium, sodium, and potassium. These elements are all bound together in the form of silicate rocks, all of which take the form of oxides
Answer:
1. Answer: Earth itself behaves like a huge bar magnet with its magnetic poles near the geographical north and south poles. ... Therefore, when a magnet is suspended freely, the magnetic poles of the earth attract the opposite poles of the magnet and the magnet comes to rest in the north-south direction.
2. The earth is made up of three different layers: the crust, the mantle and the core. This is the outside layer of the earth and is made of solid rock, mostly basalt and granite. There are two types of crust; oceanic and continental. Oceanic crust is denser and thinner and mainly composed of basalt.
3. Earth's mantle is a layer of silicate rock between the crust and the outer core. It has a mass of 4.01 × 1024 kg and thus makes up 67% of the mass of Earth. ... Partial melting of the mantle at mid-ocean ridges produces oceanic crust, and partial melting of the mantle at subduction zones produces continental crust.