Question

The depth of the earth’s crust is from __ to ____ kms.
a) 20-60
b) 25-80
c) 30-100
d) 40-150

Answer 1

Hint: The Earth consists of four distinct layers, beginning at the middle. They are the inner core, the outer core, the mantle and the crust, from deepest to shallowest. But for the crust, the thickest layer is the mantle, and the thinnest layer is the crust. It is possible to classify the Planet into four main layers: the outer solid crust, the mantle, the outer core and the inner core. Of both the thickest layer is the mantle, while the thinnest layer is the crust.

Complete answer:
- "The outermost shell of a terrestrial planet is described by "Crust. The crust of the Earth is normally split into an older, thicker continental crust and a younger, denser oceanic crust. The Earth's crust's complex geology is informed by plate tectonics. In mountainous regions, the crust is deepest.
- The continental and oceanic crusts are bound to the mantle that we talked of earlier, and a layer called the lithosphere forms this. There is a cooler portion of the mantle under the lithosphere that is still movable.
- The crust is a thin but significant region in which the deep earth's dry hot rock interacts with the surface's water and oxygen, forming new kinds of minerals and rocks. It's also where these fresh rocks are mixed and scrambled by plate-tectonic movement and injected with chemically active fluids.
- The crust is the planet's outermost layer, the cooled and hardened portion of the Earth that varies from around30-100kms in depth. This layer makes up just 1% of the Earth's total thickness, while it makes up the whole surface (the continents and the ocean floor).

Hence, the correct answer is option c).

Note: Earth developed as gravity pulled spinning gas and dust in to become the third planet from the Sun when the solar system settled into its present shape around 4.5 billion years ago. Earth has a central heart, a rocky mantle and a solid crust, as do its fellow terrestrial planets. Over time, the Earth's surface cooled and became a shell.The creation of the Earth was just the beginning and we still see the Earth moving through erosion and plate tectonics year by year.