What characteristic or property of Earth material is used to classify layers as lithosphere or asthenosphere, as well as the inner and outer core?

The lithosphere is composed of both the crust and the portion of the upper mantle that behaves as a brittle, rigid solid. The asthenosphere is partially molten upper mantle material that behaves plastically and can flow. This animation by Earthquide shows the layers by composition and by mechanical properties.

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Lithosphere                                                      

Has a lower density than the asthenosphere

Allows for conductive heat transfer

Asthenosphere

Asthenosphere is denser than the lithosphere

Allows for advective heat transfer

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not sure if this helps much, but if need i can go further into detail. happy studying!

the answer is either b or c

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.