Nubian Sandstone Aquifer System

High school (ages 12+)
Environment & Earth

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/nubian-sandstone-aquifer-system

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How big is Nubian Sandstone Aquifer System?Approximately 2,000,000 km² (770,000 sq mi)
2. What is the location?Subsurface across northwestern Sudan, northeastern Chad, southeastern Libya, and eastern Egypt
3. What is the estimated groundwater volume?150,000 km³
4. Why is the water in the Nubian Sandstone Aquifer System called fossil water?Because it was filled many thousands of years ago when the Sahara was wetter, and today it no longer receives new water from rain, making it like a fossil.
5. How do scientists learn about the past climate from the aquifer?They study the isotopic composition and age of the water, which tells them how much rain fell and how the climate changed during ancient wet periods.

Fossil Water: Groundwater accumulated in geological formations over long periods, with negligible modern recharge.
Transboundary Aquifer: An aquifer that extends across international political boundaries, requiring cooperative management.
Paleoclimate: The study of past climates, using geological and other evidence to understand Earth's climate history.
Geohydrology: The study of the occurrence, distribution, and movement of water within the Earth's crust.