Taken near the entrance of Hawai`i Volcanoes National Park (which is now closed) on May 15, 2018, at 11:28 am.
MORTON GNEISS
Morton, Minnesota
Oldest Rock in the United States — 3.524 billion years old
MORTON GNEISS
Morton, Minnesota
Oldest Rock in the United States — 3.524 billion years old
Kilauea Volcano
10 Questions About the Earth—
and the Geology of North America.
Science — History — Biography
10. Helium. Its spectroscopic lines were first noted by French astronomer Jules Janssen during a total solar eclipse on August 18, 1868. Several weeks later British astronomer Norman Lockyer noticed the same lines while observing the Sun without a total solar eclipse. The existence of helium on Earth was finally confirmed in 1895.