CREATE TABLE "list_of_artificial_radiation_belts" (
  "explosion" text,
  "location" text,
  "date" text,
  "yield_approximate" text,
  "altitude_km" text,
  "nation_of_origin" text
);

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

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

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

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

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