Tag Archives: Geology

Where are Sapphires found ?

  • Sapphires are mined as early as 7th century BC in India.
  • Blue sapphires are mainly found in India, Sri Lanka, Burma and Thailand.
  • Blue Sapphire stone is also called “neelam ratna” in hindi.
  • It is acknowledged to fastest and strongest gemstone among all the other gemstones.

Sapphire Map of World



Blue Sapphire Facts

Sapphire Mineral

What is Uluru Ayers Rock made of ?


  • Uluru is a huge chunk of rock, known as a monolith, set the middle of Australia.
  • Uluru rock is composed of arkose, a coarse grained sandstone rich in the mineral feldspar. The sandy sediment, which hardened to form this arkose, was eroded from high mountains composed largely of granite.
  • The 300 million-year-old rock is comprised of sand, feldspar (various crystalline minerals) and rock, and originally hailed from a sea floor. A large chunk is above ground today (348m), and the flat top and grooved sides are a result of weathering. Uluru was discovered by William Gosse in the 1800s, who named it after the Chief Secretary to South Australia, Henry Ayers.
  • Uluru is the Aboriginal and official name. Ayers Rock is the most commonly used name, especially outside Australia.


  • The intriguing sculpted shapes, valleys and ridges, caves, potholes and plunge pools are the result of the last few hundreds of millions of years of erosion. The flaky surface is due to chemical decomposition.

Uluru description

Uluru - How Big is Uluru

Uluru Ayers Rock, Australia

Uluru Ayers Map

Why are the Oceans Salty ?

  • The oceans cover about 70 percent of the Earth’s surface.
  • Most of Earth’s water is 97 percent salt water that is found in oceans. Only 3% is fresh water.
  • Salt Water is filled with salt and other minerals.
  • Salt in the ocean comes from rocks on land. The rain that falls on the land contains some dissolved carbon dioxide from the surrounding air. This causes the rainwater to be slightly acidic due to carbonic acid (which forms from carbon dioxide and water).

18 - Why is the Ocean Salty

Salty Ocean

Why is the Ocean Salty

Why is the sea salty - Elements in Rivers and Seas

Sea-Surface Salinity (PSU)