Earth's continents have moved over time, changing the shapes of landmasses and affecting where plants and animals live.

 Fossils help scientists learn about ancient environments and the kinds of plants and animals that existed long ago, giving us clues about past climates.

Scientists use rocks and other evidence to figure out what Earth's climate was like in the past, helping us understand how it has changed over time.

 Sea levels have gone up and down throughout Earth's history, impacting where oceans and continents meet and affecting where people can live.

Geologists use rock layers and fossils to piece together Earth's history, creating a timeline of important events and changes over millions of years.