Which two types of evidence led from the theory of continental drift to the theory of plate tectonics?

1. World maps in 1858 showed how Africa and South America fit together.
2. Oceanographers' maps revealed mid-ocean ridges and oceanic trenches.
3. Fossils discovered in the 1830s showed that Earth had grown warmer over
time.
4. Seismic data helped scientists identify the boundaries of tectonic plates.

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answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.