Erratic rocks are in Americas. They are a very important symbol in the in the history of America. Erratic rocks differ in size and type with the native rocks where it rests.
They are known as an erratic.
The word 'erratic' is a noun related to geology; a word for a large rock that does not match the rocks or rock formations in its surroundings and is believed to have been deposited by glacier.More commonly, the word 'erratic' is an adjective, a word used to describe a noun, for example, erratic behavior or erratic weather.
An erratic is a rock fragment that was carried by glaciers and deposited some distance from its source. Erratics are generally found sitting on top of rocks of different age and lithology.
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A large boulder left behind by a glacier is called a glacial erratic. These erratics are often significantly different from the surrounding rocks, providing clues about the glacier's movement and the rocks it passed over during its journey.
Erratic adj irregular, inconsistent, wandering around. Erratic noun an erratic is a rock found where it does not belong. Many millenia ago it was carried on a glacier from where it originated to where it was found.
The ocean floor is mainly basalt. Closer to the poles you would occassionally find a glacial erratic, dropped from a melting iceberg.
When a glacier melts, the rocks it carried may fall to the ground in a jumble called a moraine. This accumulation of rock, debris, and soil can form a moraine deposit at the edge or base of a glacier.
An erratic boulder is a boulder of rock which is of a different type than the local rocks. Erratic boulders are ofter more correctly termed glacial erractics as they were generally picked up, transported (often many hundreds of miles) and then finally deposited by melting glaciers.
The rock is called a glacial erratic when it is left behind by a glacier, and is of a completely different material composition than the rocks on which it was deposited.