Rift

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/rift

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. Which continent is Rift in?Formation of rift valleys, grabens, half-grabens, rift lakes, and associated volcanism
2. What is the tectonic setting?Characterized by extensional forces leading to lithospheric thinning and fracturing
3. What is the failed rifts?Rifting events that do not result in continental breakup, often forming aulacogens
4. What is a rift and how does it form?A rift is a long, straight zone where the Earth's crust pulls apart, making a deep valley called a graben or half‑graben. The pulling happens because the crust thins and cracks, often with one side rising to form rift shoulders.
5. Why do rift valleys sometimes have lakes?When a rift valley is deep enough, water can collect inside it, forming long, narrow lakes that can hold special plants and animals.

Extensional Tectonics: The geological regime involving the stretching and thinning of the Earth's crust and lithosphere.
Graben and Half-Graben: Structural depressions formed by normal faulting during rifting, with a graben being symmetrical and a half-graben asymmetrical.
Aulacogen: A failed rift arm, typically a long, linear zone of crustal extension that did not evolve into a spreading center.
Seafloor Spreading: The process by which new oceanic crust is formed at mid-ocean ridges and moves away from the ridge axis.