If you can't see through an object clearly it is an opaque object.
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No, water is not an opaque liquid. It is transparent, meaning light can pass through it easily without scattering. This is why we can see through water and why it appears colorless in small quantities.
Magma is the substance inside volcanoes. If the melted igneous rocks are inside a volcano, it is called magma. When the substance exits the volcano, it is called lava. When you see fire, that is when a lava flow travels down a mountain and reacts with other mediums such as houses.
A magnet cannot determine if a substance is metal because not all metals are magnetic. While some metals like iron, nickel, and cobalt are magnetic, many other metals such as gold, aluminum, and copper are not attracted to magnets. Therefore, the presence or absence of magnetic attraction cannot be used as a reliable indicator of whether a substance is metal.
When this substance is a solid, it is called ice. When the substance is a liquid, you can drink it to become refreshed. When the substance is turned into gas, it is invisible. The substance is water.