| A | B |
|---|
| the earth is made of three layers... | the crust, mantle and core |
| one of the layers of the earth is molten rock it is the ... | mantle |
| the outer layer of the earth is called ... | the crust |
| the earth was originally molten rock. When it cooled it formed .......rocks | igneous |
| freeze-thaw action is an example of ... | physical weathering |
| When they are hot rocks ....... | expand |
| When they get very cold rocks..... | contract |
| These acids are in the atmosphere and cause chemical weathering... | sulphuric and carbonic acids |
| Burrowing rabbits, tree roots and algae all cause... | biological weathering |
| acids attack rocks especially limestone and..... | wear them down |
| After weathering the particles are transported and deposited forming... | sedimentary rocks |
| limestone is a sedimentary rock formed from | the shells of marine creatures |
| sandgrains cemented together by a natural cement form... | sandstone |
| if large pebbles become cemented together by a natural cement .... | conglomerate is formed |
| If molten rock cools quickly the crystal size is.. | small |
| If molten rock cools slowly | crystal size is large |
| When igneous rocks form small crystals they have usually been... | extruded onto the crust or into water |
| When igneous rocks form big crystals they have been | intruded in to the crust |
| An example of an extruded rock is .... | basalt |
| an example of an intrusive igneous rock is | granite |
| when an intrusion occurs it bakes the rock it touches forming | metamorphic rocks |
| The conditions needed to form metamorphic rocks are | heat & pressure |
| If limestone is metamorphosed it forms.. | marble |
| If shale is metamorphosed it forms.. | slate |
| The crystals in igneous rocks are arranged ..... | randomly |
| sedimentary rocks are made of grains which are ....... | rounded |
| Metamorphic rocks are made of crystals which are..... | layered |
| Sediemntary rocks are laid down in layers called... | strata |
| When earth movements occur strata can get buckled this is called... | folding |
| When earth movements occur rocks can shear; this called ... | faulting |
| The earth's surface is made of huge slabs of crust called... | plates |
| If two plates collide it's a .........margin | destructive |
| At a destructive margin.. | one plate slides below another |
| If a plate slides below another the rock melts - called..... | subduction |
| When subduction occurs the rock melts and it could re-emerge as...... | magma in a volcano or other extrusion |
| During subduction sedimentary or metamorphic rocks can change to .... rocks | igneous |
| There are three types of rocks they are.. | metamorphic, igneous & sedimentary |
| When water gets in to cracks and freezes it....... | expands |
| When ice in a crack melts the crack gets... | narrower |
| when carbon dioxide dissolves in water in the air it forms..... | carbonic acid |
| This gas eventually forms sulphuric acid in the air .... | sulphur dioxide |
| carbon dioxide is formed when.... | fossil fuels like coal and petrol burn |
| sulphur dioxide is formed......... | when sulphur (impurity in coal) burns |
| rock type that never contains fossils... | igneous rocks |
| The particles in sedimentary rocks are usually rounded because... | edges get worn off when they are transported |
| Weathering is when... | rocks are broken down forming smaller fragments |
| Biological, chemical and physical are ... | types of weathering |
 | slide of igneous rock |
 | slide of metamorphic rock |
 | slide of sedimentary rock |
