<u>1. b.They have a single, symmetrical cone at the top, 2. b. broad base, 3. a. steep sides near the base with sudden, violent eruptions.</u>
Explanation:
The cinder cone is the simplest type of volcano made from the particles and blobs of conglomerate lava ejected from a single vent. The gas is blown violently into the air, and the falling cinders form a cone around the volcano.
A shield volcano eruption od mainly composed of basaltic magma, they have a low viscosity and erupts in a relatively gentle stream. Thus do not oppose a serious threat to society.
A stratovolcano is also called a composite volcano that is made up of many layers of pumice, tephra, and ash. They form highly viscous lava with steep-sided slopes.
