Rock
Japanese Name:
岩
Romaji Name:
iwa
Description
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A rock is a naturally occurring solid made up of one or more minerals.
Rocks form the Earth's crust and come in various shapes, sizes, and colors.
There are three main types: igneous, sedimentary, and metamorphic.
They differ based on how they were formed (cooling, layering, or pressure).
Rocks are used in construction, art, tools, and scientific research.
Common examples include granite, limestone, and slate.
Rocks also contain valuable resources like metals and fossils.
Their structure and composition reveal information about Earth’s history.
History
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Rocks have existed for billions of years, forming Earth’s surface and core.
The oldest known rocks date back over 4 billion years.
Ancient people used rocks to make tools, weapons, and shelters.
Rock formations have helped scientists understand geological time.
Studying rocks led to the discovery of plate tectonics and Earth’s layers.
Rocks have also been central in human culture—used in monuments and art.
In modern times, geology explores rocks to find energy and materials.
They remain crucial in understanding Earth's past and future changes.