Some of the glaciers are also volcanos but in this quiz they will go under the glacier category, there is also one of the seven highest summits that is also a volcano but it goes into the summits category here, the lakes are not just natural lakes some are reservoirs for power stations.
In order to create a playlist on Sporcle, you need to verify the email address you used during registration. Go to your Sporcle Settings to finish the process.