Tag: geography

80% of the world's natural forests is destroyed by human development activities. Forests destruction by human activity is mainly for the purpose of harvesting natural resources for industry production and urbanization. Human activity is to blame for deforestation, though natural disasters do play a role. Clearing forests for agriculture is the principal cause for habitat destruction.

Sputnik 1 was the first artificial satellite launched by the Soviet Union. The Soviet Union launched it into an elliptical low Earth orbit on 4 october 1957. It was a 58 cm (23 in) diameter polished metal sphere, with four external radio antennae to broadcast radio pulses. It was visible all around the Earth and its radio pulses were detectable.

Remote sensing refers to the use of satellite-or aircraft-based sensor technologies to detect and classify objects on Earth, including on the surface and in the atmosphere and oceans, based on propogated signals. Some of the remote sensing satellites (sensors) are LANDSAT, SPOT, IRS, AVHRR, CARTOSAT etc.

Density methods are used to describe populations. Density describes how many individuals are in that given space. We might say that there are 100 people per square mile, or 20 plants per square inch. This gives us an idea of how tightly or loosely packed the organisms are in a given space.