1-Why do you think fossils occur only in sedimentary rocks?
2-Why can’t we go to the center of the earth
3-Discuss why igneous rocks are also called primary rocks?
4.What are the uses of rocks?
5.What do you know about the core?
6.What are the difference between sial and sima?
Answers
Explanation:
Soil is loose material which lies on top of the land. It has many things in it, like tiny grains of rock, minerals, water and air. Soil also has living things and dead things in it: "organic matter". Soil is important for life on Earth. Because soil holds water and nutrients, it is an ideal place for plants to grow.
Answer:
1)Earth contains three types of rocks: metamorphic, igneous and sedimentary. With rare exceptions, metamorphic and igneous rocks undergo too much heat and pressure to preserve fossils. So most fossils are found in sedimentary rocks, where gentler pressure and lower temperature allows preservation of past life-forms
2) Since the temperature and pressure increase enormously as we go deeper and deeper inside the earth, we cannot go to the centre of the earth. ... Answer: Because of extreme heat and pressure, limestone undergoes a change in its form and turns into marble.
3)Igneous rocks are created from the cooling of molten magma/lava. All other rocks are derived from them. Because they form the basis of formation of other types of rocks, igneous rocks are known as the primary rocks
4)Our use of rocks and minerals includes as building material, cosmetics, cars, roads, and appliances. In order maintain a healthy lifestyle and strengthen the body, humans need to consume minerals daily
5)Earth's core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found about 2,900 kilometers (1,802 miles) below Earth's surface, and has a radius of about 3,485 kilometers (2,165 miles).
6)Sial is composed of silicon and aluminium.It is upper layer which forms a discontinuous cover over the Earth's crust and is entirely absent the ocean floor. Sima is composed of silicon and magnesium. This is the second layer below sial which forms the ocean base. It is also called oceanic crust.
Explanation: