What is the very bottom soil horizon called?

What is the current era in the geologic time scale?

What is the study of plant life called?

What is the science of the origin, history, and structure of the Earth called?

What type of clouds surround the eye of a hurricane?

What is the calm center part of a hurricane called?

What type of satellites are always in the same spot in Earth's orbit?

What name is given to 23.5 degrees north latitude?

What are mounds of sand that have been windblown called?

What does Earth do to cause night and day?

What is the process that removes salt from sea water?

A phytotoxin is a poison produced from what?

What is a sudden collapse and downward motion of ice and rocks down a mountainside?

What is molten rock beneath the surface of the earth called?

What element is a diamond composed of?

What is the name of the submerged fringe of a continent?

What are the broken-off pieces of glaciers that make it to the open sea called?

What name was given to the west wind by the Greeks?

What is the trapping of the sun's solar energy and radiation called?

What acidic precipitation occurs when sulfur dioxides build up in the clouds?

In the United States, summer officially begins in which month?

What layer in the atmosphere is responsible for filtering out solar radiation?

What type of clouds are thick and puffy and can sometimes turn into thunderstorms?

In what modern-day country did the dog called the Rhodesian Ridgeback originate?

How many days does it take for the Earth to revolve around the sun?