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which of the following describes a mixture?

matter that is composed of a single element and has all the same physical properties
matter that is made of molecules of all the same type
two atoms chemically bonded together
a substance made of two or more types of atoms that are not chemically bonded

A mixer is a substance made by mixing two or more substances that are not chemically bonded.

The Mixture is the result of two or more substances mixed in such a way that they remained unchanged.

The mixture has properties that depend on how much the substance is present in the mixture. We can say that a mixture is a substance that is made by adding two or more substances in such a way that they remained unchanged or are not chemically bonded with each other.

There are two categories in which mixture is classified, homogeneous mixture and heterogeneous mixture.

A Homogeneous mixture is a substance in which atoms of the substance are mixed in such a way that their separation is invisible. Examples are water and sugar.

A Heterogeneous mixture is a substance in which atoms of the substance are mixed in such a way that their separation is visible. Examples are sugar and salt.

To know more about the mixture, follow the link given below.

link.

A substance made of two or more types of atoms that are not chemically bonded

Explanation:

Mixtures are systems made up of two or more compound or simple substances that are different. Thus, they present undefined and variable physical properties. These properties depend on the amount of each substance in the mixture and the nature of them. In other words, a mixture is a substance composed of two or more types of atoms that are not chemically bonded.

Mixtures can be classified as homogeneous and heterogeneous. In the case of hydrated alcohol, we have a homogeneous mixture. But what is a homogeneous mixture? It is a mixture in which we cannot see the separation of its components. Its entire length is uniform and has a single phase. Heterogeneous mixtures, on the other hand, are those that have more than one phase, such as the mixture of water and oil, water and sand, granite (mixture of quartz, mica and feldspar) and so on.

are there options? cause you ain’t. real specific

so here is the information for current research:

-nrel's geothermal analysts, scientists, and engineers perform a full range of research from developing advanced methods of locating and accessing geothermal resources to exploring innovative technologies to extract and produce clean energy from the heat of the earth

and here is the information for the technology of geothermal energy:

-it's clean and sustainable

-resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma

-almost everywhere, the shallow ground or upper 10 feet of the earth's surface maintains a nearly constant temperature between 50° and 60°f (10° and 16°c)

-geothermal heat pumps can tap into this resource to heat and cool buildings

-a geothermal heat pump system consists of a heat pump, an air delivery system (ductwork), and a heat exchanger-a system of pipes buried in the shallow ground near the building

-in the winter, the heat pump removes heat from the heat exchanger and pumps it into the indoor air delivery system

-in the summer, the process is reversed, and the heat pump moves heat from the indoor air into the heat exchanger

-the heat removed from the indoor air during the summer can also be used to provide a free source of hot water