![Top curves](../../../../jsp/jahia/templates/GSL/gsl_templates/img/keystage3/main_top_grad.gif)
Mount Mazama (Crater Lake), USA
Caldera formed by collapse of composite volcano as magma beneath was rapidly erupted during a violent (Plinian) eruption around 7,000 years ago.
Height: 2487 m (about 3500 m before collapse)
Last eruption: around 1200 AD (Wizards Island cone)
Height: 2487 m (about 3500 m before collapse)
Last eruption: around 1200 AD (Wizards Island cone)
![Mount Mazama (Crater Lake), USA](../../../../webdav/site/GSL/shared/images/education_and_careers/RockCycle/Processes/Melting/Mazama.jpg)
![Bottom curves](../../../../jsp/jahia/templates/GSL/gsl_templates/img/keystage3/bottom_curve.gif)