Consider the following statements with reference to volcanoes:

1. Cinder cones are circular or oval cones made up of small fragments of lava from a single vent that have been blown up.

2. Shield volcanoes are volcanoes shaped like a bowl or shield in the middle with long gentle slopes made by basaltic lava flows. 

3. Lava volcanoes are steep-sided volcanoes composed of many layers of volcanic rocks, usually made from high-viscosity lava, ash, and rock debris. 

Which of the statements given above is/are correct?