Sir Benjamin Geography Notes

STRUCTURE OF THE EARTH Physical geography can be simply defined as the study of the structure of the Earth and the forces which affect it. These forces are categorized into two kinds: internal and external forces.  Internal forces  are forces which act within or beneath the Earth‘s crust. These forces result into various Earth movements such as vertical and horizontal movements, vulcanicity and earthquakes. External forces  are forces which act inside the earth‘s surface and result into various geomorphic processes such as mass wasting and weathering. The earth is composed of inner and outer zones (layers). The outer layer of the earth comprises of the atmosphere, biosphere and hydrosphere, while the inner layer includes the crust, mantle and core CONCENTRIC ZONES OF THE EARTH The earth is composed of three internal, concentric layers of increasing densities. These layers are the crust, mantle  and core.  They are made up of different layers of rocks, with their densities