Monthly Archives: March 2015

International System of Units (SI) Chart

How many base units are in the SI system ? = 7

The International System of Units is the modern form of the metric system and is the world’s most widely used system of measurement, used in both commerce and science. It comprises a coherent system of units of measurement built on seven base units.

MeterKilogram SecondAmpereKelvinCandela Mole

International System of Units SI

International System of Units

SI Globe logo

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Top 10 Rarest Gemstones in the World

Ten Rarest and Most Valuable Gemstones in the World

  1. Pink Star Diamond –  South Africa
  2. Painite – Myanmar
  3. Musgravite – Australia, Greenland, Antarctica, Sri Lanka, Madagascar, and Tanzania.
  4. Jadeite – Myanmar
  5. Alexandrite – Russia’s Ural Mountains, Brazil, East Africa and Sri Lanka
  6. Red Beryl – Utah & New Mexico of United States
  7. Benitoite – California
  8. Black Opal – Australia
  9. Taaffeite – Sri Lanka and Tanzania
  10. Tanzanite – Foothills of Mount Kilimanjaro, Northern Tanzania

Pink Star DiamondPink Star Diamond auctioned for record $83 million at Sotheby’s on November 13, 2013.

Painite                 Musgravite           Jadeite

Alexandrite  Beryl Red Emerald  Benitoite

Black Opal

Taaffeite                                                                 Tanzanite

Top 10 Largest Deserts in the World

Deserts of World MapTop Ten World Largest Deserts

  Antarctic-Desert              Arctic Desert, ArcticAntarctic Desert, Antarctica  ———————————–  Arctic Desert, Arctic

Sahara, Africa   Sahara Desert, Africa

Arabian Desert, Middle East       Gobi Desert, Asia Arabian Desert, Middle East  ———————————  Gobi Desert, Asia

Kalahari Desert       Patagonian Desert, South AmericaKalahari Desert, Africa —————————–  Patagonian Desert, South America

Great Victoria Desert, AustraliaGreat Victoria Desert, Australia

Syrian Desert, Middle East      Great Bassin Desert, North America      Syrian Desert, Middle East —————————– Great Basin Desert, North America

Why Do Earthquakes Occur ?

Deformation of Rocks

  • An earthquake is the sudden shaking of the earth surface.
  • Earthquakes are caused by movement of the Earth’s tectonic plates, and by rupture of geological faults.
  • There are 4 types of faults : Normal Fault – Oblique Fault – Reverse Fault –  Strike-Slip Fault.
  • Seismic waves are waves of energy that travel through the earth, and 3 types of seismic waves : Primary Wave, Secondary Wave, and Surface Wave.

Earthquakes

Drop ! Cover ! Hold On !

4 Types of Faults

Earthquakes - Types of Faults

Tectonic Plates and Fault Line

What Are Seismic Waves

Seismic Waves Types

Measuring Earthquakes