Admin What are the 2 outer sections of the earth?
The Earth’s Structure
- The crust. 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.
- The mantle. The mantle lies below the crust and is up to 2900 km thick.
- The core.
What are the 2 layers of the core?
The core is made of two layers: the outer core, which borders the mantle, and the inner core. The boundary separating these regions is called the Bullen discontinuity. The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel.
What is the first outermost layer of the earth?
crust
Earth’s outermost, rigid, rocky layer is called the crust. It is composed of low-density, easily melted rocks; the continental crust is predominantly granitic rock (see granite), while composition of the oceanic crust corresponds mainly to that of basalt and gabbro.
What is the earths surface made of?
Earth’s surface is mainly covered with liquid water and its atmosphere is is mainly nitrogen and oxygen, with smaller amounts of carbon dioxide, water vapor and other gases.
What makes up the outer layer of the Earth?
Earth’s outer layer is divided into several rigid tectonic plates that migrate across the surface over many millions of years, while its interior remains active with a solid iron inner core, a liquid outer core that generates Earth’s magnetic field, and a convective mantle that drives plate tectonics.
Which is the most protective segment of the environment?
The atmosphere is that segment of the environment where life sustains. It has gases that surround the earth which is known to be a protective blanket and the reason for calling it so is that it protects the beings on earth from outer hostile space.
Which is the exact shape of the Earth’s oceans?
In geodesy, the exact shape that Earth’s oceans would adopt in the absence of land and perturbations such as tides and winds is called the geoid. More precisely, the geoid is the surface of gravitational equipotential at mean sea level.
What makes up 75% of the surface of the Earth?
About 75% of the surface of the earth is a hydrosphere. All the water resources that exist on the earth such as seas, oceans, rivers, lakes, glaciers, as well as groundwater (water present under the ground), belong to the hydrosphere. We all are aware of the fact that water is an element that makes life possible on earth.