Question

Which of the following are the two different layers of the Earth’s crust? (a) mantle and core (b) magma and lava (c) tide and ebb (d) sial and sima​

Answer 1

Answer:

a answer is always right

Answer 2

Earth Crust

Explanation:

• The Earth is divided into three main layers. The hot inner core, the mantle, and the thin crust, which support all life in the known universe.

• Crust- is the thinnest layer of the Earth, consisting of less than 1% of our planet's volume. It is divided into two types: oceanic crust and continental crust. The transition zone between these is called  Conrad discontinuity. Silicates are the most abundant rocks and minerals in both oceanic and continental crust.

• Mantle- is hot and dense and moves as a semi-solid rock. The mantle is thick and is composed of silicate minerals except with more magnesium and iron and less silicon and aluminum.

• The base of the mantle, at the boundary with the core, is termed the Gutenberg discontinuity. where secondary earthquake waves, disappear and cannot travel through liquid.  

• outer core- is composed of iron and nickel found in liquid form. It reaches between 7,200 and 9,000 degrees Fahrenheit and is  1,430 miles thick. the movement of the liquid in the outer core that generates Earth’s magnetic field.
• Inner Core- is the hottest part, at temperatures between 9,000 and 13,000 degrees Fahrenheit. This solid layer is smaller than our Moon at 750 miles thick and is composed mostly of iron. The iron is under so much pressure that it cannot melt and stays in a solid-state.