Table: radiation_belts
Columns: explosion
location
date
yield_approximate
altitude_km
nation_of_origin

Question: What was the altitude of the explosion Hardtack Teak?
SQL: SELECT "altitude_km" FROM radiation_belts WHERE "explosion" = 'Hardtack Teak'

Question: What was the altitude of the event on 1962-07-09?
SQL: SELECT "altitude_km" FROM radiation_belts WHERE "date" = '1962-07-09'

Question: What was the altitude of the yield of 1.4 megatons?
SQL: SELECT "altitude_km" FROM radiation_belts WHERE "yield_approximate" = '1.4 megatons'

Question: What was the yield of the K-4 explosion?
SQL: SELECT "yield_approximate" FROM radiation_belts WHERE "explosion" = 'K-4'

Question: What explosion had an altitude of 539 km?
SQL: SELECT "explosion" FROM radiation_belts WHERE "altitude_km" = '539'