Grade 7 Word Scramble
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Question | Answer |
Rocks | Made of minerals. Usually identified by how they look. 3 main types: -igneous -sedimentary -metamorphic |
Igneous Rocks | Melted rocks, that cool and crystallize Formed inside or above earth |
Sedimentary Rocks | Made when loose rocks become stuck together Happens by compaction and cementation |
Metamorphic Rocks | Made when Igneous and Sedimentary rocks deep inside earth, are heated and under pressure for a long period of time. |
Compaction | Sediments are pressed together for a long period of time |
Cementation | Water dissolves crystals, making a glue. Some rocks will stick together forming a new rock. |
Minerals | Elements and compounds that are made naturally Made up of crystals |
6 ways to identify minerals | 1. Moh's hardness scale 2. Crystals 3. Luster 4. Colour 5. Streak 6. Cleavage/Fracture |
Moh's Hardness Scale | To test how hard the rock or mineral is, from softest to hardest. |
Crystal | Straight edges, flat sides, and regular angles. |
Luster | "Shininess" How light reflects from it |
Streak | The color that is made when the mineral is scraped or crushed |
Cleavage | The way a mineral breaks apart. It breaks with straight, flat edges. |
Fracture | Another way a mineral breaks apart. It breaks with rough, jagged edges. |
Erosion | Movement of rocks and minerals from one place to another. Usually caused by gravity, wind, and movement of water and ice. 3 types: Chemical Biological Mechanical |
Chemical weathering | Rock is changed by chemical reactions Rock is weakened by coming into contact with pollution (water, air or acids) |
Mechanical weathering | Wearing away and physical breakdown of rocks Due to gravity causing rocks to fall and break, and/or water rubbing particles of rock away Caused by wind, water, gravity, and temperature change |
Biological weathering | Rock is changed by plants or animals living in or on it. |
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Holytrinity7
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