1. Geological features created by rhyolitic magma:

* Volcanoes: Rhyolitic magma, being very viscous, often forms volcanic domes and lava flows. These flows tend to be thick and slow-moving, creating steep, rounded domes or broad, flat lava flows. Examples include the Lassen Peak in California and Mount St. Helens.

* Calderas: Rhyolitic eruptions can be explosive, creating large depressions called calderas in the ground. These form when the magma chamber empties, causing the overlying rock to collapse. Yellowstone National Park is famous for its caldera.

* Geysers and Hot Springs: Rhyolitic magma can heat groundwater, leading to the formation of geysers and hot springs. These are areas where hot water erupts or flows out at the surface.

* Ignimbrites: Rhyolitic eruptions can produce massive ash flows called ignimbrites. These are fast-moving, hot clouds of ash and gas that can travel for great distances and deposit thick layers of ash.

2. Rhyolitic magma promotes eruptions:

* Yes, rhyolitic magma is associated with explosive eruptions. Rhyolitic magma is:

* High in silica: This makes it very viscous (thick), trapping gases.

* High in volatile content: Water and other gases dissolved in the magma increase pressure.

* Erupts at lower temperatures: This means the gases have more time to build up pressure before the magma erupts.

In conclusion:

Rhyolitic magma creates distinct geological features, including volcanic domes, calderas, ignimbrites, and geysers/hot springs. It also promotes explosive eruptions due to its high silica content, high volatile content, and relatively low eruption temperatures.