Question

How do tectonic plates grow and shrink?

Answer 1

Answer:

The plates slide out of gaps that sometimes create mountains, and they can become volcanoes.

Explanation:

Answer 2

An expanding earth (growing earth) may also in time be a contracting or shrinking world. If the worlds tectonic plates (sections that make up the continents like Eurasia , Africa and the sea floor etc) can expand then they can also shrink.