EVERYDAY SCIENCE

Detailed explanation-1: -Knowing how the waves behave as they move through different materials enables us to learn about the layers that make up the Earth. Seismic waves tell us that the Earth’s interior consists of a series of concentric shells, with a thin outer crust, a mantle, a liquid outer core, and a solid inner core.

Detailed explanation-2: -Geologists record the seismic waves and study how they travel through Earth. Different types of seismic waves behave differently. The speed of the waves and the paths they take reveal the structure of the planet. Using data from seismic waves geologists have learned that Earth’s interior is made up of layers.

Detailed explanation-3: -Except in the crust, the interior of the Earth cannot be studied by drilling holes to take samples. Instead, scientists map the interior by watching how seismic waves from earthquakes are bent, reflected, sped up, or delayed by the various layers.

Detailed explanation-4: -Answer and Explanation: Depending on the type of rock sample, geologists can learn the age of rocks within the Earth, the composition of minerals below ground, and what geologic forces were at work in the page. Igneous rocks containing radioactive isotopes can help to date rock layers found deep within the Earth.

Detailed explanation-5: -Seismic waves are recorded by a machine called a seismograph, which tells us about the strength and speed of the seismic waves. These recordings made by a seismograph are called seismograms.