Answer:
First one: group
Second one: period
Third one: number of valence electrons
Last one: increases
Ionic: transfer of electrons
Covalent: sharing of electrons
Metallic: sharing of free electrons in a structure of cations
Answer:
They are found in South America and African Plates. Earths outer layer is made out of solid rock. These fossils are sometimes discovered closer to the mantle; the mantle is between the crust and the earths super-heated core!
Explanation:
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