Activity 1: Modeling Earth's Interior Structure
Animated journey to the center of the Earth:
http: //www.bbc.com/future/bespoke/story/20150306-journey-to-the-centre-of-earth/
A tool to help figure out the location on the exact opposite side of the Earth reached by tunneling straight down to the Earth's core then back to the surface:
https://www.freemaptools.com/tunnel-to-other-side-of-the-earth.htm