Our Kids Video Book About Rocks
Interesting Music Video Book For Kids About Rocks
All About Rocks
Everywhere you look you are bound to see a rock of some kind. We use them in buildings, counters, houses and play with them on the beaches, lakes and ponds. But do we really know anymore than that? Sure we know the earth is basically just one big boulder orbiting around the sun, in line with other big boulders, but there is still so much more to them than meets the eye. Let’s get busy and talk rock.
As you probably already know, the earth’s crust is made up of over 50 percent rock. In turn these rocks are made up of minerals. In fact, there are 3,000 known minerals on our planet today. Minerals are also made up of elements and we have 92 different ones that can be combined to make a mineral.
Not all minerals are a combo, silver is a pure element, but granite has quartz, feldspar and mica that take form to create this amazing rock. In addition, minerals are arranged in repeating patterns that can produce a crystal – a lot of stuff goes into the making of a simple rock.
Rocks are categorized in three areas; igneous, sedimentary and metamorphic. But they don’t always stay one type of rock. In fact, different types of rocks are formed and reformed into each category. This is called the Rock Cycle.
The cycle begins with hot magna under the ground. When this lava cools and hardens (above or below the ground) it forms an igneous rock. With the effects of weather, wind and rain, this igneous rock loses tiny pieces from it. This debris floats in the wind and finally lands. Over time and extreme pressure they turn into sedimentary rocks. When this type of rock is heated and pressurized from friction and the weight of earth’s tectonic plates, it bakes and becomes rock-hard. The changing of these rocks and the end result is called, metamorphic rock.
The mountain ranges we see today were formed from the rock cycle. As the tectonic plates moved, shifted and were pushed to the surface of the ground, mountains were formed. It took many years for the cycle to complete itself, but we can now enjoy these majestic views all over the world. Canada can lay claim to one of the oldest known metamorphic rock. The Acasta Gneiss is a rock outcrop of the Hadean tonalite gneiss and is located in the Slave craton in the Northwest Territories. This 3.58 million year-old rock formation is located on an island about 300 kilometres north of Yellowknife and is the oldest known (intact) crustal fragment on Earth.
Rocks have been here since the dawn of time and will continue to take their place, not only on earth, but also in space. Rocks build the foundation of our planet and keeps the hot spewing lava at earth’s core from bubbling up and destroying all we know. Take a look around at some rocks and think about the transformation it has most likely already gone through.
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