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Ocean current  
Ocean currents are considered to be the horizontal and vertical transport of water.  
The shell structure of the Earth  
The Earth has an average radius of 6,350 km and is made up of different layers.  
Recent earthquake information  
The German Research Centre for Geosciences is running a worldwide network to detect earthquakes in real-time.  
What is a tsunami?  
A tsunami (jap. harbour wave) is a water wave where the whole water colum is in motion.  
Mode of Operation of a Tsunami-Early-Warning-System  
Caused by a tsunami in 2004 more than 250,000 people lost their life. Warning-systems help to inform the residents early.  
Geological Natural Hazards  
Geological natural hazards are for example earthquakes, land slides, sinkholes, volcanic eruptions and tsunamis.  
Probabilistic eruption forecasting  
The probability of an upcoming eruption can be assessed based on statistical time series analysis of a volcano's past eruption record  
Volcano and eruption types  
Volcanoes are "gates" in the Earth's crust through which lava, ash and gases reach the Earth's surface. What are the different Vulcano and eruption types?  
Autonomous Ocean Observations – floats  
To keep a permanent eye on the ocean, a global network of free drifting sondes has been set up by the international community.  
What are tornadoes?  
A tornado is defined as a strong rotating air column with vertical axis, which must have contact to the ground. In most cases a tornado is visible as a funnel cloud.  
Winter Storms  
In Central Europe, each year severe winter storms cause considerable damage. A storm is defined for wind speeds in excess of 75 km/h (Beaufort 9).  
Questions and answers on tsunami early warning systems  
FAQs on the subject of tsunami early warning are answered by researchers from the Helmholtz-Gemeinschaft (Helmholtz Association).  
Lightning  
Lightning occurs about two million times a year in Germany. This article presents some basic facts about this impressive natural phenomenon.  
Magmatic gases  
Magmatic gases hold the main responsibility for magma production at great depths in the Earth's mantle. Furthermore, they are the predominant driving forces of volcanic eruptions.  
Consequences of volcanic eruptions  
Global cooling after the large-volume, highly-explosive Tambora eruption in Indonesia in 1815:  
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