{"thcode":1,"term":{"code":"ar600","name":"Igneous and metamorphic-rock aquifers","parent":"art","scope":"aquifer rock type"},"uf":[],"bt":[{"code":"art","name":"(aquifer rock types)","parent":"aroot","scope":"Generalized rock types of aquifers"},{"code":"aroot","name":"US Aquifers","parent":"fUS","scope":"Aquifers of the 48 conterminous United States, Hawaii, Puerto Ri"},{"code":"fUS","name":"United States","parent":"fLD10","scope":"country"},{"code":"fLD10","name":"North America","parent":"fLD","scope":"continent"},{"code":"fLD","name":"Land","parent":"root","scope":"continent"},{"code":"root","name":"Earth","parent":null,"scope":"Common geographic areas focused on the US"}],"nt":[],"rt":[{"code":"a607","name":"Columbia Plateau basaltic-rock aquifers","parent":"aroot","scope":"aquifer"},{"code":"a609","name":"Hawaiian Sedimentary deposit aquifers","parent":"aroot","scope":"aquifer"},{"code":"a608","name":"Hawaiian Volcanic-rock aquifers","parent":"aroot","scope":"aquifer"},{"code":"a610","name":"Pacific Northwest basaltic-rock aquifers","parent":"aroot","scope":"aquifer"},{"code":"a611","name":"Piedmont and Blue Ridge crystalline-rock aquifers","parent":"aroot","scope":"aquifer"},{"code":"a606","name":"Snake River Plain basaltic-rock aquifers","parent":"aroot","scope":"aquifer"},{"code":"a601","name":"Southern Nevada volcanic-rock aquifers","parent":"aroot","scope":"aquifer"}]}