OF ROCKS 1 COLORS 1 Rocks are different colors because they have minerals The color of the minerals in the rock can turn it brown red green or other colors 2 SIZES Why are rocks different ID: 396761
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PROPERTIES OF ROCKSSlide2
1. COLORS:1. Rocks are different colors because they have minerals. The color of the minerals in the rock can turn it brown, red, green or other colors. Slide3
2. SIZES: Why are rocks different sizes? Boulders
are the biggest type of rock, to be found on a mountain. A boulder is so big that most humans can't move them on their own
.Slide4
A cobble is a rock that is smaller than a boulder and larger than a pebble A rock is smallest when it is turned into silt. Silt is smaller than sand and often found at the bottom of rivers and streams. Slide5
3. SHAPES:3. Why are rocks different shapes? Rocks are different shapes because they are hit over and over by water and wind.Slide6
4. TEXTURE: Rock's texture—coarse-grained, fine-grained, and glassy are all descriptions of a rock's texture. The texture of igneous rocks can be analyzed to understand how the rock became solid or crystallized from liquid, melted rock.
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COARSE-GRAINED Slide8
GLASSY TEXTURE Slide9
FINE-GRAINED Slide10
5. HARDNESS:Rating Description Mineral Example
:
1
Very
Soft
Easily crumbles. Can be scratched with a fingernail (2.2)
Talc
2
Soft
Can be scratched with a fingernail (2.2) Gypsum, Soapstone Slide11
3 Soft Can be scratched with a copper penny (3.5) Calcite 4 Semi-Hard Can be scratched with a common nail (5.2) Fluorite 5
Hard
Can be scratched with a common nail (5.2). Apatite Slide12
6 Hard N. B. Mineral of hardness 6 or more will scratch glass. Feldspar 7 Very Hard Can be scratched with a concrete 8
Very Hard
Topaz
9
Extremely Hard
Used in industrial tools for cutting, grinding & sanding. Corundum
10
The Hardest
Diamond is used to cut all minerals including diamonds. DiamondSlide13
6. HEAVINESSRocks are measured through their mass. It can be considered light or heavy.