This is just the beginning! Our collection holds over 300 years of history, including rare newspapers, obituaries, marriage records, birth records, and so much more—most of which you won’t find anywhere else!
25 Mile Deep Earth Crust Found
Washington reports a 25 mile thick crust with a marked division to the mantle. Measurements from explosions across multiple regions support an iceberg-like model of mountains and a uniform lower crust around 49 kilometers deep.
MENTIONED IN THIS ARTICLE
Washington
Nana
Trelearth
Department
Carnegie
Middle Atlantic
Appalachians
Tennessee- Virginia
Minnesota
Maryland
Mesabi
Canada