answer these questions
1 define the following
a focus
b epicentre
c richter scale
d tsunami
ans
Class 7
Answers
Explanation:
The hypocenter is the point within the earth where an earthquake rupture starts.
The epicenter is the point directly above it at the surface of the Earth.
Also commonly termed the focus.
The Richter scale is a scale of numbers used to tell the power (or magnitude) of earthquakes.
A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake.
Answer:
a.technical : a point at which rays of light, heat, or sound meet or from which they move apart or appear to move apart especially : the point at which an image is formed by a mirror, a lens, etc.
b.The epicenter, epicentre or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.
c.a numerical scale for expressing the magnitude of an earthquake on the basis of seismograph oscillations. The more destructive earthquakes typically have magnitudes between about 5.5 and 8.9; it is a logarithmic scale and a difference of one represents an approximate thirtyfold difference in magnitude.
d.A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. ... But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases. The speed of tsunami waves depends on ocean depth rather than the distance from the source of the wave.