This is an example of Venus volcanism. Click on image for full size version (40K GIF) Image from: NASA

Volcanic rises are thought to be formed by plumes, in a similar fashion to island formation on Earth. On Venus, there are three types of volcanic rises:

• Rift-Dominated Rises
  • These are rises that contain two or more deep rift valleys. These valleys cut through most of the rise itself, but also extend several hundred kilometers beyond the rise itself. Atla Regio and Beta Regio are rift-dominated rises.
• Volcano-Dominated Rises
  • These rises lack deep rift valleys. They do contain one or more large shield volcanoes. Western Eistla Regio and Imdr Regio are volcano-dominated rises.
• Corona-Dominated Rises
  • These rises lack large rift valleys, like volcano-dominated rises. But instead of being dominated by shield volcanoes, their surfaces are dominated by coronae. Corona-dominated rises include Eastern Eistla Regio and Themis Regio.

This is an example of Venus volcanism. Click on image for full size version (40K GIF) Image from: NASA

Volcanic rises are more like islands than a continents. They are thought to be formed by plumes, in a similar fashion to island formation on Earth. Measurements suggest that there is hot magma deep beneath these rises which, through heat, help to hold up the rises and support their mountains, as shown in this picture.

There are three types of volcanic rises:

• Rift-Type Rises
  • These are rises that contain two or more deep rift valleys. Beta Regio is an example of a rift-dominated rise.
• Volcano-Type Rises
  • These rises contain one or more large shield volcanoes.
• Corona-Type Rises
  • These rises lack large rift valleys, like volcano-Type rises. But instead of having many shield volcanoes, these rises have many coronae.

This is an example of Venus volcanism. Click on image for full size version (40K GIF) Image from: NASA

Volcanic rises are more like islands than a continents. They are broad, sloping highlands over 1000 km across. They are cut by deep troughs and have shield volcanoes near the top. Measurements suggest that there is hot magma deep beneath these rises that helps to hold them up, as shown in this picture.