Question

Bacaan, :

Rocks
Rocks are very hard materials. Some rocks contain metals.
They are called ores. Others contain fossils of animals or plants
that die millions of years ago. Many rocks contain crystals. A few
rock crystals, such as diamond, are extremely valuable because
they are very rare. These crystals are called gems. Some rocks,
such as sandstone, are made when mud or grains of sand are
slowly squashed together.

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Answer 1

• The text provides information about rocks, including their physical characteristics, types, and uses.
• Diamond is valuable because it is very rare, and it has unique physical properties, such as its hardness, brilliance, and ability to refract light.
• Sandstone is a type of rock that is made up of sand-sized grains of mineral, rock, or organic material that are held together by a cementing material, such as silica, calcium carbonate, or iron oxide. It is formed through the process of lithification, which involves the compaction and cementation of loose sediment. Sandstone is a common rock type that is used in construction, for building facades, and for decorative purposes.

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