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8th ScienceUnit2

8th grade Science Unit 2 SECTION4 and 5 LAYERS OF EARTH AND CONVECTION

QuestionAnswer
DRAW AND LABEL THE 4 MAIN LAYERS OF EARTH Crust, Mantle, Inner Core, Outer Core
OF THE 4 MAIN LAYERS, WHICH HAS THE LEAST DENSE COMPOSITION? Crust, Inner Core
IS THE INNER CORE A SOLID OR LIQUID> EXPLAIN WHY? The inner core is a solid, even thogh the outer core is a liquid and the inner core is even hotter, the pressure on the inner core is great enough to keep the iron composition of the inner core a solid.
WHAT CAUSES CONVECTION CURRENTS INSIDE THE EARTH? The extreme heat on the inside of the earth, at its core, which heats the partially melted mantle causing currents and circulation.
EXPLAIN HOW CONVECTION CURRENTS WORK. The less dense molten material rises as it gets hotter, while the farther away from the core (and heat surface) the material gets the cooler it becomes. As it cools it becomes denser than its surrounds and begins to sink causing a circular motion or current.
Created by: asimien907