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Rocks

S

QuestionAnswer
ALLEDGEDLY POSSIBLY
Sedimentary rocks consist of lots of small grains. These grains may be weakly held together, so the rocks are often porous and may be (s and c) soft and crumbly.
These types of rocks are often pourous, consist of layers of lots of small particles and may be soft and crumbly: Sedimentary rocks.
Sedimentary rocks consist of layers of lots of small p… articles and are often p… orous.
How sedimentary rocks are formed: sediment such as (s and s) sand and silt, is d…. eposited in layers (called sediments). The build up of layers is called sedimentation. The layers become c… compacted to form sedimentary rock. The distinct layers of rock are related to the time intervals at which occurred sedimentation.
Some Sedimentary rocks are formed by the cementation of sediment. Weathering creates small rock fragments which are transported to the sea where they are deposited (sink) and form a sediment. At this stage, dead creatures may become t…. rapped within the sediment and give rise to
At this stage, dead creatures may become t… rapped within the sediment and give rise to fossils. Over millions of years, the pressure of (the ones above) layers and the effects of salts lead to the sediments cementing together. This is how sedimentary rocks like sandstone, mudstone and limestone are formed.
Sedimentary rocks can also be formed from m… inerals which are left behind when water evaporates. Certain minerals are dissolved in (s and l) seas and lakes. Over millions of years these seas or lakes dry up. As the water disappears, the minerals that have dissolved p… recipitate.
Marble is a hard s… mooth rock made from sedimentary (l or c) limestone or chalk in conditions of strong heat and low pressure.
Slate is a grey rock with fine grains made from sedimentary shale in conditions of low temperature and low pressure. Slate can be split into thin sheets.
Metamorphic rocks often have layer structures of crystals caused by the effect of (h and p) heat and pressure.
Metamorphic rocks, in comparison to sedimentary rocks, are usually ( d and h) denser and harder. Metamorphic rocks sometimes show distortions caused by the movements that led to their formation. This may give rise to wavy or zig-zag patterns within the rock.
Metamorphic rocks contain regular layers of crystals that sometimes have a wavy or zig-zag arrangement.
Metamorphic rocks contain regular layers of crystals that sometimes have an arrangement that’s (w or z-z) wavy or zig-zag.
Metamorphic rocks are formed by the effect of extreme (p and t) pressures and temperatures(heat?) deep within the Earth. These conditions change the structure of existing rocks so that new rocks are formed. The rocks that were put under great pressure and heated did not m[] melt, but changed c[] chemically.
Transparent sheets used as an insulator in some electrical devices. What type of Metamorphic rock? Mica.
Granite is a hard g… Granite is a hard g… crystals that are randomly arranged.
Pumice is a pale g… rey rock made up of crystals that are very small, and is p… orous and extremely (in mass) light.
Basalt is a glassy rock that is d… ark, which has very fine crystals and often forms as columns of rock.
A dark glassy rock which has very fine crystals and often forms as columns of rock is Basalt.
Igneous rocks contain interlocking crystals which are held together very strongly and make the rock hard.
The crystals in igneous rocks have a ‘disorderly’ arrangement. The size of the crystals depends on how quickly the igneous rock solidified. Igneous rocks never contain fossils.
How are igneous rocks formed? Deep in the ground is molten rock called magma. Sometimes, there’s a burst through the surface by magma causing volcanic eruptions. Igneous rocks are formed when magma both cools and solidifies.
When magma cools above the surface, rocks are formed that are extrusive igneous rocks, but when magma cools below the surface, rocks are formed that are intrusive igneous rocks.
Magma above the Earth’s surface cools at a speed that’s quick. Only small crystals are formed as the magma solidifies. This is how extrusive igneous rocks like pumice and basalt are formed.
Magma below the Earth’s surface cools at a speed that’s slow. There is time for large crystals to grow as the magma solidifies. This is how extrusive igneous rocks like granite are formed.
The rock cycle: rocks are broken down by weathering, then taken to the sea by (t and d) transportation and deposition.
In the rock cycle: magma may turn to Igneous rocks through slow solidification and metamorphic rocks may turn to magma through melting.
In the rock cycle: sedimentary rock is turned into metamorphic rock by high temperature and pressure. Sedimentary rocks may also join the rocks that rise to the surface by (u and e) uplift and erosion. These rocks then partake in stage one. || Molten magma rises to the surface, where it cools at a speed that is r… apid to form extrusive igneous rocks.
In the rock cycle: molten magma that cools below the surface forms intrusive igneous rocks, which rise at a speed that’s slow to the surface by both uplift and erosion.
Molten rock in the ground is magma.
The size of crystals in rocks that solidify quickly is small, while it's the opposite for the rocks that solidify slowly.
Rocks with rounded grains are more likely to absorb [] than rocks with interlocking grains water. This is because the water can get into the gaps between the grains. Rocks that absorb water are called porous. Rocks with rounded grains are usually softer and more crumbly than rocks with interlocking grains. So porous rocks tend to be softer than non-porous rocks.
[] weathering is caused by physical changes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves Physical.
Limestone, chalk and sandstone are rocks that’re sedimentary.
Sandstone is a rock with a colour that’s quite orange, it looks like lots of sand grains stuck together and in terms of hardness is quite soft.
Limestone is a rock, that in colour is quite a mixture of grey and white and is mostly made from crushed sea shells, it often contains fossils.
A white or grey powdery rock is known as chalk, it has very fine grains and often contains fossils.
Created by: Toluo