Sand is made of tiny pieces of rock that have been worn down by wind and water. Explain why the formation of sand is a physical change.

This change is only a physical change because the wind and water do not change the chemical make-up of the rock, the weathering is only changing the size nothing else.

Explanation:

Physical changes happen when objects or substances experience a change that does not alter their chemical constitution.

Because some of the physical characteristics of the rocks change, but their personalities do not. The shreds of rock are ordered as their sizes and shapes change, but their identities and total section endure the same.

well, they made a movie about how animals lived there.

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."