1. some volcanoes have explosive eruptions, like the one at mount st. helens in 1980. eruptions like these can cause abrupt changes to earth's surface.

which of these could result from an explosive volcanic eruption?
a) a flow of ash and debris rushes down the volcano's slope.
b) part of the volcano is blasted away.
c) volcanic ash covers the surrounding area.
d) all of these

Which choice best describes the general trend for the countries shown, for the period 2008 - 2010?

The president’s role in a political party is to set the legislative agenda true or false

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change