its clay
Clay is the answer you're looking for.
elements and compounds
mixture
Compounds between metals and oxygen are called oxides.
The temperature is called the melting point of the material, and varies greatly for different elements and compounds.
An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
Surface water usually contains more inorganic material compared to groundwater. This is because surface water is exposed to more elements and can pick up sediment and pollutants as it flows over land, whereas groundwater is filtered as it moves through soil and rocks, resulting in lower levels of inorganic material.
Because it's easy to work with, and it's weather proof. (The lead forms a patina when exposed to the elements that seals it in, so it won't leach lead into the groundwater.)
An element is a material that has only one kind of atom. For example- hydrogen is an element- it has only hydrogen atoms. Another element is oxygen- it has only oxygen atoms. But if we combine the two elements together, add a spark, we have a bang- and we now have a compound- water. Compounds are 2 or more elements that combine chemically.
No, pebbles are not compounds. Pebbles are small stones or rock fragments that are typically made up of a single mineral or material like quartz, basalt, or limestone. They are composed of a single substance, not a combination of different elements like compounds.
aquifer
other material