Physical Geography Online Quiz

A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star.

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. It does not belong to the solar system.

The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years.

Keoladeo National Park in Bharatpur, Rajasthan hosts thousands of migratory birds. It is famous for nesting its resident birds as well as for guest migratory birds including the rare Siberian Cranes.

A falling air pressure generally means there is an approaching storm that will arrive within the next 12 to 24 hours.

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism.

The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water vapour and aerosols. Troposphere is the warmest because it is closest to the ground, where the heat is coming from.

The Campos, grassland with few trees or shrubs except near streams, lies between 24°S and 35°S; it includes parts of Brazil, Paraguay and Argentina, and all of Uruguay.

The tundra climate region occurs between 60° and 75° of latitude, mostly along the Arctic coast of North America, Eurasia (Europe and Asia) and on the coastal margins of Greenland.

A geosynchronous orbit is located at 35,786 km above Earth's equator. This position is a valuable spot for monitoring weather, communications and surveillance. Geosynchronous orbit is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours, 56 minutes, and 4 seconds.