Union
$$A \cup B =$$
{ earth, grass, heaven, interpret, lake, mountain, organize, river, select, thunder, wood }
Symmetric Difference
$$A \ominus B =$$
{ earth, grass, heaven, interpret, lake, mountain, organize, river, select, thunder, wood }
Difference
$$B - A =$$
{ earth, grass, heaven, lake, mountain, river, thunder, wood }
Cartesian Product
$$A \times B =$$
{ (interpret, earth),
(interpret, grass),
(interpret, heaven),
(interpret, lake),
(interpret, mountain),
(interpret, river),
(interpret, thunder),
(interpret, wood),
(organize, earth),
(organize, grass),
(organize, heaven),
(organize, lake),
(organize, mountain),
(organize, river),
(organize, thunder),
(organize, wood),
(select, earth),
(select, grass),
(select, heaven),
(select, lake),
(select, mountain),
(select, river),
(select, thunder),
(select, wood) }