The discovery of radioactivity in 1896 made it possible to determine the precise ages of rocks.
Earth cycles Global cycles of life-giving elements
Most „iron“ meteorites are iron-nickel alloy with a few scattered inclusions of sulfide minerals.
chromium, gold, platinum, iridium, tungsten and other elements
In the Milky Way Galaxy alone, there are hundreds of billions of stars. But that hasn’t always been the case… Take a look at the life cycle of stars in this photo gallery.
Stars are factories for new elements.
Driven by heat from molten rock, the entire ocean circulates every one to ten million years.
Earth cycles Global cycles of life-giving elements
The iron meteorite was found in Oregon. It’s the largest ever recovered in the US, and the sixth-largest in the world.
inside stars, which produce energy by fusing lighter elements
These resources explore one particular star: our Sun. Students can learn what it’s made of, how we study it, and how it was formed 4.6 billion years ago.
Our Star: The Sun The Abundance of Elements in
These short videos explain how igneous, pegmatitic, metamorphic, hydrothermal, and weathering environments produce Earth’s amazing variety of minerals.
They form where abundant water and certain chemical elements
Oakley is an example of a meteorite that formed at an intermediate distance from the Sun (ordinary chondrites).
These meteorites have a mixture of rock-forming elements
The largest sea-going canoe of its kind now in the world, the Great Canoe’s hull is carved from one western red cedar tree.
changed hands, new owners often added their own design elements
Sharon Hoffmann studies past climate and ocean circulation using geological materials, to better predict how modern and future climate will behave. She grew up on Long Island, NY, atop a glacial mo…
climate changes, using naturally-occurring radioactive elements
