1. Oceans: The vast majority of Earth's water is found in the oceans, covering over 70% of the planet's surface.

2. Ice Caps and Glaciers: Huge amounts of water are locked up in frozen form at the Earth's poles and in mountain glaciers.

3. Groundwater: Water seeps underground and fills spaces between rock and soil, forming aquifers. We access this water through wells.

4. Rivers and Lakes: Water flows across the land surface in rivers and collects in lakes, forming a vital part of the water cycle.