Types of rocks
Identify the three mains types of rocks.
The three types of rocks are Sedimentary, igneous and metamorphic
what is compaction.
Compaction is the compacting, squeezing and crushing together of rocks.
what is a Metamorphic rock
Rocks that are changed as a result of exposure to intense heat and/or pressure
Basalt is an example of which type of rock?
Igneous
What is the difference between magma and lava?
Magma - molten rock below the surface of the earth
lava - molten rock above the surface of the Earth
Minerals that precipitate from evaporation are called
mineral deposits
True or false Sedimentary rocks are
What is Contact metamorphism.
Rocks that have been changed due to exposure to heat
Marble is an example of which type of rock?
Metamorphic
How are igneous rocks formed?
An igneous rock is a rock that has formed from the
cooling and solidification of magma or lava
Rocks are classified into three main types depending on:
1. where they are found
2. their colour
3. how they were formed
4. how old they are
They classified into three main types depending on how they were formed.
what is cementation
Cementation is glueing or sticking together of rocks.
what is Regional metamorphism
Rocks that have been changed due to exposure to pressure.
Rocks are classified into three groups. Metamorphic rocks make up one of these. Identify the two groups of rock that metamorphic rocks are formed from.
Metamorphic rocks are formed from igneous and sedimentary rocks.
Where are all extrusive igneous rocks are formed
All extrusive igneous rocks are formed from lava.
This type of rock is formed from lava ON the earth's surface.
What is extrusive igneous rocks.
Explain why limestone and coal referred to as ‘biological rocks’.
Limestone and coal are sometimes referred to as biological rocks as it contains biological material
The processes that can cause rocks to change form and become metamorphic rocks are increased temperature and what else?
pressure
Explain what the bands in metamorphic rocks tell us about how the rocks were formed.
The bands in a metamorphic rock tell us that the rock was originally a sedimentary rock.
Explain how you would decide whether an igneous rock came from a volcano (formed from Lava instead of Magma).
To determine whether an igneous rock came from a lava or magma you will need to look at the size of the crystals (if any)
The rock is black with a glossy texture.
It is igneous
Why are fossils only found in sedimentary rocks?
Fossils are only found in sedimentary rocks because the heat and pressure that form igneous and metamorphic rocks would destroy the fossil.
how can Gneiss can be distinguished from granite?
Gneiss can be distinguished from granite because of its layers
Describe one way in which intrusive rocks can become visible on the Earth′s surface.
- being pushed up by earths tectonic plates
- being uncovered due to digging
- being uncovered due to weathering and erosion
the presence of ‘bubbles’ in some igneous rocks tells us that it formed from lava containing lots of what?
The presence of ‘bubbles’ in some igneous rocks tells us that it formed from lava containing lots of air?