what volcano dominates the sothern portion of the island of Hawaii?

Mauna Loa is probably the volcano you mean.

To determine the volcano that dominates the southern portion of the island of Hawaii, you can follow these steps:

1. Start by searching for information on the geography and volcanic activity of Hawaii.
2. Look for a source that provides a list of the major volcanoes in Hawaii.
3. From the list, identify the volcanoes located in the southern portion of the island.
4. Cross-reference the identified volcanoes with their characteristics, such as their size and activity level.
5. Determine the volcano that fits the description of dominating the southern portion of the island based on its size and activity.

In this case, by following the steps above, you will find that the volcano dominating the southern portion of the island of Hawaii is Mauna Loa. Mauna Loa is one of the five major volcanoes on the island and is considered the largest active volcano on Earth. It is located on the southern part of the island and has a historically high eruption frequency.