On May 18, 1980, a massive eruption of Mt. St. Helens in Washington State sent a huge plume of ash more than 50,000 feet into the air. Over the next two weeks, the ash traveled around the world. To move that far, the ash would've had to
A) dissolve in the nitrogen of the air.
B) combine with moisture in the troposphere.
C) bind to aerosols in the lithosphere.
D) reach into the stratosphere.
Question 2
Efforts to limit global deforestation should be concentrated
A) in the northern hemisphere.
B) in South America, Indonesia, and Africa.
C) wherever there is the greatest concentration of people.
D) in regions with the highest production of agricultural crops.
Global view of Mars as seen by the Viking 1 orbiter in 1980, showing the Valles Marineris (center)
An activation barrier, representing the transition state
Before the stick is broken, it must first be bent (the transition state).
Arctic Ice Cap 1980
After the Eruption of Mount St. Helens in 1980
An antique painting is purchased in 1980 for $995. The value increases by 3.1% e