Question

what does it mean when an element has been sequestered? it is turned into energy. it is released into the air. it completely disappears. it is isolated in a stable form.

Explanation:

In environmental - related contexts, when an element is sequestered, it is removed from a more mobile or reactive state and stored in a stable form, often to prevent it from contributing to processes like the greenhouse effect (e.g., carbon sequestration). It is not turned into energy, released into the air in an active sense, or made to disappear.

Answer:

It is isolated in a stable form.