305. Fact

Atoll
Coral reef resembling a horse shoe, enclosing a lagoon.

306. Fact

Axis
An imaginary line joining north and south poles.

307. Fact

Avalanche
A vast mass of snow mixed with earth or stones.

308. Fact

Biosphere
Animate or inanimate organic kingdom on earth.

309. Fact

Canyon
A deep valley cut by a river through a mountain region, e,g., the grand canyon of the colarado river in the usa.

310. Fact

Continental shelf
Land adjoining a continent submerged in the sea.

311. Fact

Cyclones
A low pressure system area in which the wind blows spirally inward.

312. Fact

Crop rotation
Growing different crops needing different minerals for their growth in the same piece of land in order to get more yield.

313. Fact

Date line
An imaginary line pointing north-south approximating to the meridian 180 (east or west) where the date changes by one day the moment it is crossed.

314. Fact

Delta
Alluvial deposit shaped like greek letter, formed at the mouth of the river, where it falls into the sea, e.g., the sunderban delta.

315. Fact

Dew
Condensed atmospheric water vapours due to the cooling of the air.

316. Fact

Dry farming
Growing of crops in low rainfall areas by moisture conservation, crop rotation but without irrigation.

317. Fact

Equator
An imaginary line dividing the earth into two equal parts.

318. Fact

Equinoxes
The day on which nights and days are of equal duration, e.g., march 22 and september 23.

319. Fact

Erosion
Wearing away of the earth's land surface by rain, wind, water, etc. Rendering the land infertile.

320. Fact

Eclipse
When one earthly body obscures another one partially or completely.

321. Fact

Fog
When the atmospheric moisture touches cold earth and condenses on dust particles.

322. Fact

Frost
When the atmospheric moisture deposits in the shape of icy flakes on the exposed objects or near the ground due to below freezing point temperature.

323. Fact

High seas
The parts of the sea which do not come under the territorial jurisdiction of the nations.

324. Fact

Iceberg
Huge mass of ice separated from glacier in the polar regions. These masses of ice float in the oceans with 9 parts submerged in the ocean and one part visible.

Fact
In Gabon, there are several 1.8 billion years old natural nuclear reactors.      .. More >>