Which of these are features of most stratovolcanoes

Stratovolcanoes, also known as composite volcanoes, typically have the following features:

- **Steep sides near the top with thick, slow-moving lava**: Stratovolcanoes are characterized by their steep profiles, which are formed by the accumulation of layers of lava flows, volcanic ash, and other volcanic debris. The lava from stratovolcanoes tends to be more viscous due to its higher silica content, which results in thicker lava that does not flow as easily.

- **Sudden violent eruptions**: Stratovolcanoes are known for their explosive eruptions due to the pressure build-up from the viscous magma. When the pressure is released, it can lead to violent eruptions.

So, in summary, the features of most stratovolcanoes would be:
- Steep sides near the top with thick, slow-moving lava
- Sudden violent eruptions

The other options you mentioned do not align with the typical characteristics of stratovolcanoes.