Earthquake should be the answer. When tectonic plates are shifted it causes an earthquake.
They are all rock with different size and shapes and are located in different areas possibly in the same areas but they all have there own unique textures from the photographs and 3 of them look like maybe a fossil of some type of when the dinosaurs where still around and the rocks on the top left corner look smooth and are a small type of igneous rocks. That have been soothed over the years.
GAGTTA is what you have.
CTCAAT is what you’ll get.
A matches with T, G matches with C, and U is only for translating out of the DNA sequence.
D. USA
The universe is the largest out of the Earth, moon, Milky Way, and solar system, and the USA is the largest part of Dan's address.