3. Define Plate tectonics./bo
4. What is Tsunami? 162.16
163
5. What is a Volcano? Mention its major
components. 163
6. What is an Earthquake and how it occurs? /62
7. What are seismic waves and mention its
types? / 6
8. Write about the Pacific Ring of fire.
Give Reasons for the
Answers
Explanation:
1 Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle
2 A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. ... Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.
3 Volcano, vent in the crust of the Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases.Magma and other volcanic materials are channeled to the surface where they are expelled through a crack or hole. The main parts of a volcano include the magma chamber, conduits, vents, craters and slope
4 An earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane. ... Sometimes an earthquake has foreshocks. These are smaller earthquakes that happen in the same place as the larger earthquake that follows.
5. Types of wave
Seismic waves are fundamentally of two types, compressional, longitudinal waves or shear, transverse waves. Through the body of the Earth these are called P-waves (for primary because they are fastest) and S-waves (for secondary since they are slower).
6.The Ring of Fire, also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. ... The abundance of volcanoes and earthquakes along the Ring of Fire is caused by the amount of movement of tectonic plates in the area.