what will happen to the added volume when you terminate an instance?

When Instance terminates, the default /root volume will be deleted, but the added volume will remain provisioned in your account. (If DOT is selected for added volume, it will delete automatically).

If you need to store frequently accessed, high-throughput sequential workloads such as log processing, which EBS volume type is most suitable?

Frequently accessed workloads such as data warehousing, big data, and log processing can use the ST1 (HDD) EBS volume type. since its cost effective than Provisioned IOPS SSD (io2)

what will happen to the added volume when you terminate an instance?

what is the usage of encrypt option, while creating volume from a snapshot?

what will happen when you reboot an EC2 instance?