Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
Constructive boundary
|
Two plates that move apart from each other
|
|
|
Destructive boundary
|
Two plates that move towards each other
|
|
|
Conservative boundary
|
The plates move horizontally past each other, without creating or destroying the earths crust
|
|
|
Subduction zone
|
When the oceanic plate sinks underneath the continental plate
|
|
|
Composite volcano
|
Are made up of alternating layers of lava and ash, others are made from lava only
|
|
|
Sheild volcano
|
Tend to be found at constructive plate boundaries. Low with gentle slopes, formed by basic lava which is thin and runny. Basic lava spreads quickly to form low shield shaped volcanoes. Erupt frequently and gently.
|
|
|
Epicentre
|
Is point on the earth's surface directly above the foucus.
|
|
|
Richter scale
|
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.
|
|
|
Mercalli scale
|
a twelve-point scale for expressing the local intensity of an earthquake, ranging from I (virtually imperceptible) to XII (total destruction)
|
