Graphs make it easier to understand data by making it:

The visible lines on a map or graph that extend left to right are called:

The visible lines that extend up and down on a globe or map are called:

Which of the following is the correct latitude of the North Pole?

A bone sample contains only 1/4 of its original radioactive C14 content. The half-life of C14 is 5700 years. What is the age of the bone sample?

Which of these correctly shows Earth's atmospheric composition?

Animal life became possible on Earth after -

Where did the oxygen in Earth's atmosphere come from?

Human activities (transportation, factories, etc.) are responsible for the INCREASE of which of these gasses?

The use of certain aerosols and refrigerants have caused a DECREASE in which of these gasses (this gas protects us from harmful UV radiation)?

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