Short Answer Questions 1. What is crust ?2.Does the internal and external change keep on occurring in the structure of the earth ?3. Which crust is thicker than oceanic crust?4. What are igneous rocks?5. How are the rocks useful to us?

Short Answer Questions 1. What is crust ?2.Does the internal and ext

1.	Short Answer Questions 1. What is crust ?2.Does the internal and external change keep on occurring in the structure of the earth ?3. Which crust is thicker than oceanic crust?4. What are igneous rocks?5. How are the rocks useful to us?
Answer» 1)a hardened layer, coating, or deposit on the surface of something soft."a crust of snow"2)Despite our tendency to consider Earth as static, it is actually a dynamic and ever-changing planet. Wind, water, and ice ERODE and shape the land. Volcanic activity and earthquakes alter the landscape in a dramatic and often violent manner.3)At 25 to 70 km, continental crust is considerably thicker than OCEANIC crust, which has an average thickness of around 7–10 km. About 40% of Earth's surface area and about 70% of the volume of the Earth's crust is continental crust.4)Igneous ROCK, or magmatic rock, is one of the THREE main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.5)Rocks and minerals are all around US! They help us to develop new technologies and are used in our everyday lives. Our use of rocks and minerals includes as building material, cosmetics, cars, roads, and appliancesExplanation:✌