Which statement best describes chemical properties of matter? chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure. chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure. chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form. chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

I believe your answer is the last one.     D. Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

In meteorology, a  cloud  is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body. nephology is the science of  clouds, which is undertaken in the  cloud  physics branch of meteorology.cirrus clouds  usually describe clouds high in the atmosphere that can include wispy clouds, typically with ice crystals. variations include cirrus, cirrocumulus and cirrostratus as defined by the cloud's position in the atmosphere.layered stratus clouds  have both flat tops and bases, and can appear as if they take up the whole sky, stretching from horizon to horizon. other combinations and variations include stratus, stratocumulus, nimbostratus and altostratus.cumulus clouds  often pile up in multiple layers of the atmosphere, representing clouds that develop vertically. cumulus clouds often look like pillars with anvil-type tops or columns of clouds stacked vertically. variations include cumulus, cumulus-congestus, cumulonimbus and altocumulus.

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