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29 results for “igneous rock”
Magma against lava, intrusive against extrusive, and why cooling place decides texture. Classifying rocks by how they form. Geography 2.1 Rocks Igneous comes from fire, but the fire is underground as often as it is a vol…
Where each rock type is found in Kenya, how geologists put an age to rock, and why it matters. The previous lesson. Geography 2.1 Rocks Kenya's rocks are not distributed at random. The coast is limestone, the Rift is vol…
…es are decided by origin, not by colour or hardness, and field clues must serve that rule. Minerals that make rocks. Geography 2.1 Rocks Black rock is not automatically igneous. Soft rock is not automatically sedimentary…
How one Kenyan rock becomes another: Rift lava to sediment to marble, and granite unroofed then weathered. Marble, slate, quartzite and soapstone. Geography 2.1 Rocks The opening lesson showed a cycle diagram. This lesso…
Heat and pressure change existing rock without melting it; contact against regional metamorphism. Fossils in sedimentary rock. Geography 2.1 Rocks Metamorphic means changed form. The rock does not melt. If it melted, the…
Why molten rock rises, and the landforms it makes above and below the surface. Sub-strand 2.1 on rocks and 2.2 on tectonic forces. Geography 2.3 Vulcanicity Beneath the crust, rock is hot enough to melt. Usually it stays…
The difference between a rock and a mineral, and the three families of rock. Nothing. Everyday familiarity with stones is enough to start. Geography 2.1 Rocks Pick up any stone. It looks like one substance, but hold it t…
Coarse interlocking crystals, Kenyan basement granite, and why it makes good building and monument stone. How igneous rocks form. Geography 2.1 Rocks If you can see separate crystals locked together, with no fossils and …
…melt reaches the air. Intrusive vulcanicity (plutonism) is magma that cools inside the crust. We only see the rock later, when erosion strips the cover. The names look like a list to memorise. They are actually a list of…
1. Name the processes that turn igneous rock into sedimentary rock. 2. Name the processes that turn sedimentary rock into metamorphic rock. 3. How can metamorphic rock become igneous rock? 4. Give a Kenyan example of roc…
Grain size as a cooling clock: granite coarse, basalt fine, pumice holey, obsidian glass. Volcanic rocks of the Rift and highlands. Geography 2.1 Rocks You cannot watch a batholith cool. You can read the cooling speed fr…
Weathering, transport, deposition and lithification, from Kenyan highlands to coast and lake basins. Igneous texture and cooling rate. Geography 2.1 Rocks Every sandstone began as someone else's mountain. The recipe is a…
What a mineral is, how it differs from a rock, and the few minerals a Kenyan learner actually meets in granite and limestone. What rocks are made of. Geography 2.1 Rocks The opening lesson said a rock is a mass of minera…
Igneous, sedimentary and metamorphic settings concentrate different minerals, so a geology map is a prospecting map. Metallic, non-metallic and fuel minerals. Geography 3.2 Mining You do not look for limestone in granite…
1. How does cooling rate affect crystal size in igneous rock? 2. Match granite, basalt, pumice and obsidian to a cooling story. 3. Why can pumice float even though it is igneous rock? 4. A rock has large crystals set in …
Basalt, phonolite, tuff and pumice as Kenya's everyday extrusive rocks, from Mount Kenya to the Chyulu Hills. Granite and other intrusive rocks. Geography 2.1 Rocks Most Kenyan learners live nearer a lava stone wall than…
A field routine: look, grain, layers, fossils, hardness, then family and a Kenyan name if you can. The rock cycle with Kenyan examples. Geography 2.1 Rocks The competency is to classify an unfamiliar sample from features…
1. Distinguish magma from lava. 2. Distinguish intrusive from extrusive igneous rock, with one example of each. 3. Why is Mount Kenya's rock mostly extrusive, while some western hills are granite? 4. Why is volcanic tuff…
What decides whether a deposit is worth mining, and the methods used to get at it. Sub-strand 2.1 on rocks and 2.3 on vulcanicity. Geography 3.2 Mining There is gold in seawater. Nobody mines it, because extracting it wo…
… magma, and why Koobi Fora and Olorgesailie sit where they sit. Limestone, coral and diatomite. Geography 2.1 Rocks Kenya holds some of the world's most important early human fossils. They are all in sedimentary deposits…
Geography define a rock and a mineral classify rocks as igneous, sedimentary or metamorphic describe how each type of rock forms explain the significance of rocks to human activities Collect and classify rock samples fro…
1. What is a fossil? 2. Why are fossils found in sedimentary rock but not in igneous rock? 3. Name two Kenyan fossil sites and the rock setting of each. 4. A dyke cuts fossil-bearing shale. Which is younger, and did the …
The metamorphic rocks Grade 10 must name, with Kenyan marble, gneiss and Kisii soapstone as the local set. How metamorphic rocks form. Geography 2.1 Rocks Names without a Kenyan place slide off. This lesson pins marble, …
…rtile soils while parts of the north-east do not. 3. Explain why early human fossils are found in sedimentary rock but never in igneous rock. 4. A drilling company is looking for groundwater. Explain how knowing the rock…
1. Define a mineral and a rock. 2. Name the three minerals that make granite. 3. Why can limestone be almost one mineral and still be called a rock? 4. Is soda ash from Lake Magadi a rock type in the igneous-sedimentary-…
1. Name four extrusive igneous rocks found in Kenya. 2. Name three Kenyan places built of volcanic rock. 3. Give a use of basalt or phonolite and a use of pumice. 4. Why are Nairobi buildings not made of the same stone a…
1. What decides whether a rock is igneous, sedimentary or metamorphic? 2. Give one field clue for each family. 3. Why can a fossil not occur in granite? 4. Classify pumice, coral limestone and Kisii soapstone, with a rea…
…t visible there? 3. Give two uses of granite. 4. Why is Mount Kenya not built of granite even though both are igneous? Granite and other intrusive rocks
1. Name one mineral typical of igneous, one of sedimentary and one of metamorphic settings. 2. Explain why limestone occurs on the Kenyan coast. 3. Explain why soda ash occurs at Lake Magadi. 4. Diamonds in Botswana occu…