Hazardous earth keywords Flashcards
Eccentricity meaning
measure the departure of the ellipse from circularity orbit.
Obliquity meaning
the term describing the angle of tilt of the Earth’s axis.
Procession meaning
the slow, conical motion of the earth’s axis of rotation.
An eye of a tornado meaning
the centre of a tropical cyclone when drier air is falling again, giving a period of calm.
Convection currents meaning
they move layers of magma and convection of the ocean make waves.
Convergent boundary meaning
plates are pushing into each other. E.g. Nazca and South American plate.
Convergent boundary meaning (Collision)
two continental plates collide and plates buckle, creating fold mountains. E.g. Indo-Australian and Eurasian plate.
Divergent boundary meaning
plates are moving apart allowing magma to rise to the surface. E.g. North American/Eurasian plate.
Conservative boundary meaning
plates are sliding past each other creating friction. E.g. Pacific and North American plate.
Shield meaning
formed by eruptions of thin, runny lava which flows a long way before is solidifies.
Composite meaning
formed by eruptions of viscous, sticky lava and ash that do not flow far.
Focus meaning
the central point of an earthquake under the surface where activity happens.
Epicentre meaning
the point on the surface directly above the focus.
