A mineral is a naturally occurring inorganic compound, usually crystalline in form.
Porosity is the ratio of pore volume to total volume of a rock.
The focus is the area in Earth's crust where the earthquake occurs and where seismic waves radiate outwards from. The epicentre is the point directly above the focus on the surface of Earth.
The image shows ammonites. Here's an artists reconstruction of what one Jurassic era ammonoid might have looked like.
The Richter scale.
The Richter scale was developed in the 1930s by Charles Richter at the California Institute of Technology. It remains the most widely known scale for measuring earthquake magnitudes (and according to an actual A-level mark scheme is the correct answer to this question), although in 2002 the United States Geological Survey began using an updated scale called the moment magnitude scale.
Sand dune, or barchan.
It's a sand dune, also known as a barchan. These dunes are produced by wind mostly coming from one direction, and are crescent-shaped.
Weathering is wearing away something by exposing it to the atmosphere.
Number 1 shows a normal fault, 2 shows a reverse fault, and 3 shows a graben (also known as rift) valley. Graben happen when you get parallel normal faults, when land is pulling apart.
A silica solution permeates the pores in a shell and causes silicification.
The Paleozoic era is split into six geological time periods. It began with the Cambrian period, followed by the Ordovician, Silurian, Devonian, Carboniferous, and finally the Permian.
439 million years ago252 million years ago65 million years ago
Also known as the K/T extinction, the Cretaceous–Tertiary mass extinction event is when the (non-avian) dinosaurs – along with a lot of other organisms – were wiped out.
Cassiterite is a tin oxide mineral, and the most important tin ore.
Only People Who've Taken A-Level Geology Will Get 10/12 On This Test
Whoops, turns out you don't know much about A-level Geology. Perhaps you never took it, or have only just started.
Not bad! You got at least 50% right on this test, so we'll give you a C. It's not the greatest mark in the world but it proves you know a thing or two about A-level Geology, so well done.
Well done! You didn't manage to get top marks but you passed this comfortably. Either you got a good mark in A-geology or are currently studying it, or you just really love rocks.
Congrats! You know your stuff when it comes to A-level Geology.
Amazing! You clearly know your stuff when it comes to A-level Geology. Congratulations.
Kelly Oakes is science editor for BuzzFeed and is based in London.
Contact Kelly Oakes at firstname.lastname@example.org.
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