Earth
Scientists Say: Supercontinent
These gigantic landmasses form when much of Earth’s landmass smashes together.
HS-ESS2-7
Construct an argument based on evidence about the simultaneous coevolution of Earth systems and life on Earth.
More Stories in HS-ESS2-7
- Physics
Explainer: Radiation and radioactive decay
Like clockwork, radioactive forms of some elements shed parts of themselves as they attempt to become nonradioactive.
- Physics
Explainer: Radioactive dating helps solve mysteries
Knowing the decay rate of radioactive elements can help date ancient fossils and other artifacts.
- Physics
Cosmic timeline: What’s happened since the Big Bang
Energy, mass and the cosmos' structure evolved a lot over the past 13.82 billion years — much of it within just the first second.
- Life
From icebergs to smoke, forecasting where dangers will drift
Smoke drifts. Fish eggs float downstream. Where such drifting things end up may seem a mystery. But research can predict where they’ll end up.
- Earth
Scientists Say: Anthropocene
Humans are changing the world in profound ways. Some scientists think those changes have launched a new epoch in Earth’s history: the Anthropocene.
- Animals
Tiny animals survive 24,000 years in suspended animation
Tiny bdelloid rotifers awake from a 24,000-year slumber when freed from the Arctic permafrost.
- Fossils
Sudden shark die-off 19 million years ago eliminated most species
New fossil evidence shows 90 percent of sharks died in the mysterious event.
- Animals
Let’s learn about dinosaurs’ fearsome neighbors
Dinosaurs may get much of our attention, but there were plenty of other interesting critters during the Age of Reptiles, including our mammal ancestors.
- Plants
Dinosaur-killing asteroid radically changed Earth’s tropical forests
The asteroid collision initially reduced the diversity in what had been sunny tropical rainforests. In time, the forests would become permanently darker.
