CREATE TABLE "table1_1416612_1" (
  "state" text,
  "highest_point" text,
  "highest_elevation" text,
  "lowest_point" text,
  "lowest_elevation" text,
  "mean_elevation" text
);

Question:  how many mean elevation with lowest point being gulf of mexico and state being texas
SQL: SELECT COUNT("mean_elevation") FROM "table1_1416612_1" WHERE "lowest_point"='Gulf of Mexico' AND "state"='Texas';

Question: what's the highest point with lowest point being belle fourche river at south dakota border
SQL: SELECT "highest_point" FROM "table1_1416612_1" WHERE "lowest_point"='Belle Fourche River at South Dakota border';

Question: what's the lowest elevation with highest point being charles mound
SQL: SELECT "lowest_elevation" FROM "table1_1416612_1" WHERE "highest_point"='Charles Mound';

Question: what's the lowest point with highest point being mount greylock
SQL: SELECT "lowest_point" FROM "table1_1416612_1" WHERE "highest_point"='Mount Greylock';

Question: what's the state with highest point being mount katahdin
SQL: SELECT "state" FROM "table1_1416612_1" WHERE "highest_point"='Mount Katahdin';