TOPICS Seismic Waves – Earthquake Waves An earthquake is the shaking of the earth caused by the sudden movement of the earth's outermost crust. Minor earth tremors caused by Read More.. What is soil? Soil is one of the major natural resources of nature and without which there would be no life. Soil supports plant life and is important to the ecosystem. It holds water, Read More.. Planetary Winds Planetary Winds: The winds blowing throughout the year from high pressure belts to low pressure belts in the same direction are called “planetary or prevailing winds”. Read More.. Local Winds Local Winds: These are winds that occur in small area and are short-lived lasting for several hours or a day. They are caused by local differences of temperature and pressure. Read More.. What is Air mass? An air mass is a large body of air that has mostly uniform properties of temperature and humidity. Air masses can cover hundreds or thousands of square kilometers across the Read More.. What is a Tsunami? A tsunami is a large ocean wave caused by sudden displacement of huge amounts of water. Tsunami is a Japanese word for “Harbour wave”. Tsunamis are sometimes called Read More.. Major Landforms - Mountains Mountains make up nearly about 27% of the earth’s surface. They are formed by processes called orogeny. Mountains are landforms that rise above its surrounding terrain. Read More.. Earth: The Earth’s Crust The Earth is the third planet from the Sun. It is the only planet in the solar system where life is known to be found. Earth is the only planet known to have lots of liquid water. Read More.. What are the four basic types of deserts? A desert is a dry place with very little rainfall. They cover more than one-fifth of the earth’s surface. Most deserts receive less than 10 inches Read More.. What are the four types of marine sediments? Sea floors are mostly covered in sediments which are formed by various sources with different compositions. Marine sediments are either Read More.. Facts about Lakes Lakes are bodies of fresh or salt water surrounded by land. Studies estimate that lakes occupy only about 2.8% of the Earth’s total surface area. Most of the lakes are located in higher latitudes Read More.. What are Ocean Currents? | Types of Ocean Currents Ocean currents are a continuous or permanent movement of ocean water. Some ocean currents are temporary, while others take Read More.. Volcanic Landforms Volcanic activity is one factor to form landforms. Volcanic landforms are a result of accumulations of solidified lava and other volcanic products. Molten magma released from volcanoes Read More.. Thunderstorm Thunderstorms are violent, short-lived weather condition which is accompanied by gusty winds, heavy rain and sometimes hails. They earned the name as they make thunderous noise when Read More.. Okavango Delta The Okavango Delta (formerly spelt Okovango) is one of UNESCO World Heritage Site located in Botswana. It is one of the largest delta systems measuring 18000 square kilometres. The Delta Read More.. Tibesti Massif The Tibesti Massif or the Tibesti Mountains is one of the volcanic mountains but is no longer active in the Sahara. Located in southern Libya and northern Chad, it spreads to an area of over Read More.. Inuit (people) Inuit are aboriginal people who inhabit the regions of Alaska, Canada, Greenland and Siberia. The word Inuit means ‘people’ and they are similar to the Mongoloid people. The Inuit were once Read More.. The Twelve Apostles (Australia) The Twelve Apostles are the nine majestic and breath-taking rugged limestone stacks formed at the Great Ocean Road along Victoria's Coastline in Australia. They are situated off the cost of Port Read More..