A. Explain the terms in one or two sentences:
a) Pangaea
b) Continental drift
c) Earthquake d) Epicentre
e) Richter scale f) Volcano
Answers
a. Pangea, also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth.
b.Each continent has its own tectonic plate and the continual slow movement of the plates subsequently causes movement of the continents— called continental drift.
c.The boundaries where the tectonic plates meet are the areas of the world with the most violent natural earthquake activity.
d.the point on the earth's surface directly above the focus of an earthquake or underground nuclear explosionCompare focus
e.The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included for the variation in the distance between the various seismographs and the epicenter of the earthquakes.
f.A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle.
Answer:
a) a supercontinent that incorporated almost all the landmasses on Earth.
b) the gradual movement of the continents across the earth's surface through geological time.
c) any sudden shaking of the ground caused by the passage of seismic waves through Earth's rocks.
d) the point on the earth's surface vertically above the focus of an earthquake.
e) a numerical scale for expressing the magnitude of an earthquake
f) A volcano is a rupture in the crust of a planetary-mass object, such as Earth.