1. Why is the Earth called a ‘dynamic planet’?
2. What is the continental crust made of?
3. Describe the composition of the core of the Earth.
4. What is a rock? What are the three main types of rocks?
5. Why are igneous rocks called primary rocks?
6. Explain the process of formation of metamorphic rocks.
7. Why is the upper part of the continental crust called sial?
8. Why are intrusive igneous rocks large grained in structure?
9. Why are fossils found in sedimentary rocks?
10. Why do rocks change from one type to another?
Answers
1. The Earth is a dynamic planet that has been constantly changing since it came into being. Driven by powerful convection cells inside the Earth, continents drift, giving rise to earthquakes, volcanoes and mountain ranges. ... It is this interdependence that makes our planet unique in the solar system.
2. “sial.” Sial stands for silicate and aluminum, the most abundant minerals in continental crust.
3. Unlike the mineral-rich crust and mantle, the core is made almost entirely of metal—specifically, iron and nickel. The shorthand used for the core's iron-nickel alloys is simply the elements' chemical symbols—NiFe. Elements that dissolve in iron, called siderophiles, are also found in the core
4. There are three kinds of rock: igneous, sedimentary, and metamorphic.
rock is a mineral formed on earth's crust
5. Rocks which are formed by solidification of magma are known as primary rocks.
6. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
7. The name 'sial' was taken from the first two letters of silica and of alumina.
8. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form.
9. most fossils are found in sedimentary rocks, where gentler pressure and lower temperature allows preservation of past life-forms. Fossils become a part of sedimentary rocks when sediments such as mud, sand, shells and pebbles cover plant and animal organisms and preserve their characteristics through time
10. The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.
Explanation:
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