What substance in the upper atmosphere blocks ultraviolet radiation from the sun, making life on land possible?

a. methane

b. ozone

c. water vapor

d. carbon dioxide

The most explosive volcanic eruptions are associated with what type of volcano?

What is a dry riverbed that fills with water after strong rains

Which mountain range forms the longest chain in Africa? A. Atlas B. Ethiopian Highlands C. Pyrenees D. Ural

Which country has the largest GDP in South America

Approximately 30 percent of Greece's population lives in a Trieste C. b. Athens d Crete Naples

Starting with the hypothesis that a planet near Uranus was the cause of the orbital discrepancy, scientists had to develop a plan to find the unidentified planet. They started with what they knew about the discrepancies in the orbit of Uranus.

What is one way in which parties demonstrate commitment to a platform? by asking voters for monetary contributions to a campaign fund by purchasing media advertisements to attack opposing philosophies by ascertaining that all eligible voters in an

Do most deserts receive, on average, less than 50 inches of rain, less than 10 inches of rain, or less than 1 inch of rain each day

Why does the government place excise taxes on goods such as cigarettes and alcohol?

Where did the Austronesian languages originate? A. near present-day Indonesia B. near present-day New Zealand C. near present-day Easter Island D. near present-day Hawaii