Lesson 1
German reasearch ship that studied the oceans during the 1920s
Meteor
Satellite used to monitor ocean surface temperatures
Topex/Poseidon
Device that uses echoes to map features of the ocean floor
Sonar
: 1st ship to use sophisticated measuring devices to study the ocean
Challenger
Scientific study of Earth's oceans
Oceanography
Oceans on Earth have existed for _.
4.6 billion
One possible source of Earth's water is _____.
comet impacts
Gases emitted by volcanoes contain mostly ____.
water vapor and carbon dioxide
In Earth's early history, water vapor in the atmosphere condensed into the ______.
oceans
Water is still being added to Earth's hydrosphere by ______.
volcanism
The total amount of water on Earth stays the same because water molecules in the atmosphere are destroyed by ___.
ultraviolet radiation
The _____ contain 97% of the water found on Earth.
oceans
Approximately 3 percent of Earth's water is located in the ____ of Greenland and Antarctica, and in rivers, lakes, and underground sources.
frozen ice caps
