Sand, seawater, and salt are substance because all of these matter has a specific composition and specific properties.
A substance is defined as a matter which has a specific composition and properties. A compound is a mixture that is the same or uniform throughout. Think of the example of salt water. This is also called a "homogenous mixture." A blend that is not a solution is not constant throughout. Saltwater is a homogeneous mixture or a solution. Soil is collected from small pieces of a variety of materials, so it is a heterogeneous mixture. Water is a substance; more correctly, because water is controlled by hydrogen and oxygen, it is a compound.
So we can conclude that Salt and other combination can only be decomposed into their elements by a chemical process.
Learn more about Saltwater here: https://brainly.com/question/18761619
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