Where do you think that other atoms come from

atoms come from originallyThe first source was the BIG BANG that created the Universe 14 billion years ago. When the big bang occurred, the elementary particles initially were too hot initially to make any stable atoms... but after a few thousand years, when things cooled down a lot, Hydrogen and Helium got made.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.