click below
click below
Normal Size Small Size show me how
6th Interim Review
E. Science Mid Interim Review (1st Semester)
Question | Answer |
---|---|
How are igneous rocks formed? | Magma or lava (molten material) cools and hardens |
List the processes involved in creating sedimentary rocks | weathering, erosion, deposition, compaction and cementation |
What conditions must exist for metamorphic rocks to form? | Extreme heat and pressure |
Explain the differences between intrusive and extrusive igneous rocks | Intrusive rocks form when magma cools below the surface slowly, with a coarse-grained texture and large crystals; Extrusive rocks form when lava cools above or on the surface quickly, with a fine-grained texture and small or no visible crystals |
Explain the processes involved in the rock cycle | Cooling/hardening of molten material, Weathering/Erosion of sediments, Compaction/Cementation of sediments, Melting (heat) and pressure of existing rock |
What are the 5 characteristics of a mineral? | Naturally occurring, Solid, Inorganic, Definite Chemical Composition, Crystalline Structure |
Describe how minerals are used as resources in society | Quartz in glass; Gold in jewelry; Talc in powder or soap; Halite in salt |
What is an ore? | A rock with an economically useful mineral inside |
Why are gemstones valuable? | Gemstones come in beautiful colors and they are rare |
How are minerals related to rocks? | All rocks contain two or more minerals |
How do fossils form? | Organisms die and are buried by sediment which harden |
List and describe the different types of fossils | trace-signs or organisms' activities; petrified-organism is replaced by minerals; mold-impression left where the organism was buried; cast-copy of what the organism looked like; carbon film-thin coating of carbon from the organism marked on a rock |
Explain how life forms have gone through changes on Earth? | Organisms that lived in the past were simple and have become more complex |
What does the principle of uniformitarianism explain? | Geologic processes that occurred in the past occur the same currently, like weathering, erosion, deposition |
State the law of superposition | Younger rock layers live above older rock layers |
Contrast relative and absolute age | Relative age-the age of rock layers compared to other surrounding rock layers, ex: "younger" or "older" |
Absolute age-the exact age rock layers formed, ex: 200 million years ago | |
What does the principle of original horizontality state? | Sediments are laid down in horizontal layers |
Describe how fossils show evidence of Earth's changing surface | Fossils show evidence of climate change and there have been marine fossils found on land, indicating these organisms lived in other environments |
What is Earth's geologic time scale? | A timeline of Earth's history including information about rocks and past life forms divided up into smaller segments of time |
How have scientists determined the age of the earth? | Absolute dating |
What are some of Earth's natural resources? | Trees, Oil, Water, Soil |
Compare renewable and nonrenewable resources | Renewable-resources that form or can be replaced as fast as they are used; Nonrenewable-resources that can not form or be replaced at the rate that they are used |
How does the sun influence other energy sources? | The sun heats the air which results in wind and the sun drives the water cycle |
What are some examples of alternative energy resources? | Wind power, Solar energy, Hydroelectric energy, Biomass, Geothermal energy |
Give examples of renewable and nonrenewable resources | Renewable-solar, wind; Nonrenewable-fossil fuels |
What are the three fossil fuels? | Coal, Petroleum (Oil), and Natural gas |
What are the problems with using fossil fuels? | They cause pollution |
How can nonrenewable energy resources be conserved? | Reduce the amount used and consider alternative resources |