What Is an Iceberg?
What Is an Iceberg? If a glacier reaches the sea, its forward edge breaks off, forming huge floating blocks of ice called icebergs. Icebergs
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What Is Cement Made From?
What Is Cement Made From? Cement is made from a mixture of lime, clay, silica, iron and aluminum minerals. Limestone is the most important s
What Causes Earthquakes?
What Causes Earthquakes? Earthquakes happen when two large pieces of the Earth’s crust suddenly slip. This causes shock waves to shake the s
What Causes an Earthquake?
What Causes an Earthquake? An earthquake is caused by movements that take place beneath the Earth’s surface. The outer layer (crust) of th
How Are Mountains Formed?
How Are Mountains Formed? Mountains are created by slow movements in the earth’s crust. In some places, heat and pressure deep inside the