The Arctic Circle is defined by the National Snow & Ice Data Center, available at nsidc.org/cryosphere/arcticmeteorology/arctic.html http://home.barclays/annualreport http://gpo.gov/fdsys/pkg/CFR-http://gpo.gov/fdsys/pkg/CFR-2012-title30-vol3/pdf/CFR-2012-title30-vol3-sec716-3.pdf http://nsidc.org/cryosphere/arctic-meteorology/arctic.html http://nsidc.org/cryosphere/arctic-meteorology/arctic.html home.barclays/annualreport Barclays PLC Environmental Social Governance Report 2019 55 Oil Sands Oil sands refers to naturally occurring deposits of water and clay, containing a heavy, viscous oil called bitumen.