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Rocks & Minerals
| Question | Answer |
|---|---|
| Which change in rocks involves melting? | Rock changing to magma |
| When geologists have to determine relative ages of rocks, they can use... | The Law of Superposition |
| Which layers of rock are the oldest? | The rocks deeper in the Earth are older than the ones closer to the surface. |
| Which property of radioactive decay allows scientists to determine the absolute age of a rock? | The half-life because it occurs at a set rate. |
| How can sedimentary rocks be a good example of the law of superposition? | The rocks form in layers- In UNDISTURBED layers the oldest rock is at the bottom with the youngest rocks on top. |
| What happens to isotopes during radioactive decay? | An unstable isotope can break down and when this happens, it forms into a more stable isotope (Unstable, Radioactive Parent Isotope turns to a stable Daughter isotope) |
| If the results of the same experiment are not the same what should the experimenters do? | Check procedures and tools for errors. |
| What is a constant? | The thing(s)that STAY the SAME in order to make an investigation fair and valid. |
| An investigation usually starts with... | a question |
| Igneous rock is sometimes broken-down into sediments, what type of new rock can these sediments form? | a sedimentary rock |
| Given the right conditions, which types of rocks can eventually form into a metamorphic rock? | sedimentary and igneous |
| How are models helpful in science? | Models make things that are too large, too small, too dangerous or unaccessible in real life easier to understand |
| What are models good at doing? | Enlarging something that is small, showing how objects affect each other or showing how objects change over time, etc. |
| Some examples of models include: | maps, globes, a diagram of the water cycle, a drawing of parts to machinery, a solar system made of objects, etc. |
| When rock melts and magma cools, what type of new rock is formed? | Igneous |
| What is empirical evidence? | Evidence based on observed and measured phenomena- knowledge gained from actual experience. |
| What is a Theory? | Theories explain WHY something happens- an evidence based explanation. |
| What is a Law? | Laws describe WHAT happens- describes, but does not explain. |
| In what layer of the Earth do convection currents occur? | Convection currents occur in the mantle. |
| What happens BEFORE sediment is cemented together to form a sedimentary rock? | Deposition must occur first. |
| How could a geologist prove that a large rock is younger than the surrounding rocks? | The geologist could compare the amount of radioactive minerals in the large rock and some of the surrounding rocks for proof. |
| When would it be appropriate to use radiometric dating? | Radio metric dating would be appropriate when looking to identify the absolute age of a rock. |