2

Jazz Gets Some Zzs

3

The Frogs and The Ox

4

Hadrian's Wall, England

3

Glaciers of the World

3

Comets

3

Individual Sports

3

Drainage Basins of the World

4

The Tower Bridge, London

3

Harbors of the World

4

Nile River, Egypt

4

Forbidden City, China

2

Hess and his Sticky Mess

4

Sossusvlei Dunes, Namibia

3

Straits of the World

3

Wetlands of the World

4

U.S.S. Arizona Memorial at Pearl Harbor

4

Buckingham Palace, London

4

Victoria Falls, Zimbabwe/Zambia

4

Food to Know

3

Sinkholes of the World

4

Big Ben, London

4

The Willis Tower

3

The Sun

4

Burj Khalifa, United Arab Emirates

3

Neptune

4

Ngorongoro Crater, Tanzania

3

Galaxies

3

Saturn

4

The Golden Gate Bridge

4

Money