Why did scientist think another eruption at Mount St. Helens was unlikely?

When did oceans first appear

What is the difference beween nautical miles and miles?

The Richter scale a) works well for very large earthquakes. b) measures the size of an earthquake in terms of the damage it does (its intensity). c) is today termed a local magnitude (ML) reading.

Which kind of map would be used to show population density in the countries of the world? 1. a political map 2. a physical map 3. a resources map 4. a special purpose map

What elements and compounds primarily make up the sphere?

A food product that has to be important to

Scientists infer that oxygen in Earth's atmosphere did not exist in large quantities until after (1) the first multicellular, soft-bodied marine organisms appeared on Earth (2) the initial opening of the Atlantic Ocean (3) the first sexually

Tree growth is hindered in tundra regions due to low temperatures and short growing seasons. True or False?

Surface water is deep-ocean water. true or false.

How are plate boundaries related to volcanoes