Lava flows are the least hazardous of all processes in volcanic eruptions. How far a lava flow travels depends on the flows temperature, silica content, extrusion rate, and slope of the land. A cold lava flow will not travel far and neither will one that has a high silica content. Such a flow would have a high viscosity<span> (a high resistance to flow). A basalt flow like those in Hawai'i have low silica contents and low viscosities so they can flow long distances. Such a flow can move as far away as 4 km from its source and have a thickness of 10 m (Bryant, 1991). These flows can move at rates of several kilometers per hour (Scott, 1989). </span><span>More silica-rich flows can move as far away as 1.3 km from their sources and have thicknesses of 100 m (Bryant, 1991). These flows can move at rates of a few to hundreds of meters per hour (Scott, 1989). If a lava flow is channelized or travels underground in a lava tube then the distance it travels is greatly extended.</span>
Answer:
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The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.
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ANSWER:</u></h3>
Maps with isobars, maps with isotherms, weather service maps are the information we get from the National Weather Service.
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EXPLANATION:</u></h3>
<u>Isobars:</u>
- There are lines in the world map, each connecting lines have a point which has the same atmospheric pressure over the time provided.
<u>Isotherms:</u>
- These are also the same lines on the world map in which the lines on it have connecting points giving us the same temperature at the given time or say for an average period of time.
<u>Weather service map:</u>
- It is the structure we see in the globe or in atlas.
The term for <span>heat transfer because of direct contact is know as </span>conduction.
