GROUNDWATER

Groundwater is water under the Earth’s surface. Most groundwater is found in porous rocks, which have tiny holes in them. If a hole is bored straight down through the rock, groundwater is eventually found at a certain level. This level is called the water table, and it usually rises when rainwater soaks into the ground. A spring is a place where groundwater emerges from a hillside.

ARTESIAN BASIN

An aquifer is a layer of porous rock that can fill with water, like an underground reservoir. Sometimes, part of an aquifer is covered by rock that water cannot flow through, such as clay. This forms an Artesian basin. If a well is sunk through the basin to the aquifer, water flows into the well.

EGYPTIAN OASIS

Even in arid (dry) places such as deserts, groundwater sometimes comes to the surface. These lush green areas are called oases. The water at an oasis may have travelled underground from mountains hundreds of kilometres away. Oases are an important source of water, and towns often grow up around them.

Copyright © 2007 Dorling Kindersley

stay connected

Sign up for our free email newsletters and receive the latest advice and information on all things parenting.

Enter your email address to sign up or manage your account.

Facebook icon Twitter icon Follow Us on Pinterest

editor’s picks

highlights

12 Pumpkin Activities and Crafts for Kids
Pumpkins and gourds are perfect for fall fun and games with the kids. Find the best pumpkin activities, crafts, printables, and recipes to enjoy with your children this Halloween season.

Kindergarten Readiness App Wins Gold
Our Kindergarten Readiness app won the Gold Award of Excellence in the educational category at the 2014 Communicator Awards. This valuable checklist comes with games and activities to help your child practice the essential skills she needs for kindergarten. Download the Kindergarten Readiness app today!

15 Best Slow Cooker Meals
Too busy to cook? Try one of these deliciously easy slow cooker meals and have dinner waiting when you get home!

Find Today's Newest & Best Children's Books!
Looking for newly released books for your child? Try our new Book Finder tool to search for new books by age, type, and theme, and create reading lists for kids!