entrance huhu sana makapasa

• it is one of the inner planets in the solar system 


  earth
• the earth has two main layers - crust and mantle
• according to the radiometric dating record, it is said to be 4.56 billion yrs old
• atmosphere is the set of layers of gases that blankets the planet held by the planet's gravity
• atmosphere consist of 78% nitrogen, 20.98% oxygen, 0.93% argon and 0.04% of water vapor
• there are different layers of the atmosphere include the troposphere, stratosphere, mesosphere and thermosphere
• hydrosphere is the liquid component of the earth including oceans, glacial waters and fresh waters bodies
• freshwater bodies covers 70% of the earth surface
• 98% of the water on earth was saltwater
• geosphere is the solid sphere of the earth. this is where geologic process such as vocanism and orogenesis take place
• lithosphere is a part of the geosphere that is composed of the solid, outermost part of the planet
• biosphere is the living sphere of the earth
• biosphere is the totality of all the ecosystems in the whole planet