This image shows an area in which a glacier has melted. What is indicated by the number "2"? 
Definitions:
Product-rating Organizations
Independent bodies that evaluate and rate the quality, safety, or performance of various products and services.
Government Agencies
Organizations that operate at the federal, state, or local level to administer and enforce laws, regulations, and public policies.
Public Sources
Information or data available from government entities or other organizations accessible by the general public.
Relational Sources
Information about a product or service that comes from personal relationships, such as friends or family.
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