DIFFERENCIATE BETWEEN THE FOLLOWING
CLASS - 7
RATNA SAGAR BOOK
Answers
Answer:
What is the difference between the earth's core and its crust?In geology, a crustis the outermost shell of a rocky planet, like Earth (as opposed to a gaseous planet, like Jupiter). The crust of the Earth consists of various rock composites and other material. It is about three times thicker under the continents than it is under the oceans, and the oceanic crust is made up of different materials and denser rock. The crust makes up less than 1% of Earth's volume.The Earth's core is at the true center of our planet. No one will ever drill deep enough tosee it. (And no one would want to; the temperature of the inner core is close to that of the sun — almost 10,000 degrees Fahrenheit!) But seismic measurements prove that the earth's core is divided into two parts, a solid inner core with a diameter of about 1,500 miles — about 70% of the size of the Moon — and a liquid outer core with a diameter of about 4,200 miles. The inner core was discovered in 1936 by Danish seismologist Inge Lehmann and is believed to be made up of about 80% iron (by comparison, only about 4% of the Earth's crust is made up of iron). Recent discoveries suggest that the innermost part of the core may contain gold and platinum, too.
Sial and sima
Sial refers to the earth's crusts upper layer, it is made up of rocks abundant in silicate and aluminium based minerals. ... Sima is the earth's crusts lower layer and contains rocks with an abundance of magnesium silicate minerals, the word Sima is an amalgam of the first two letters of Magnesium and Silica.
ROcks and minerals
A mineral is a naturally occurring, inorganic solid with a definite chemical composition and a crystalline structure formed by geological processes. A rock is an aggregate of one or more minerals whereas a rock may also include organic remains and mineraloids. Some rocks are predominantly composed of just one mineral.
Intrusive and extrusive rocks
Extrusive rocks and intrusive rocks both form when hot molten material crystallizes. However, extrusive rocks form from lava at the surface of the Earth, whereas intrusive rocks form from magma underground, often relatively deep in the Earth. A pluton is a block of intrusive igneous rock.