Crust:
Crust Like bread, the Earth’s crust is it’s outermost and thinnest layer.
Rocks R Us:
Rocks R Us The crust is made of igneous, sedimentary and metamorphic rocks (more about these in Unit 4).
Composition:
Composition The most abundant elements in the crust are oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium.
Lithosphere:
Lithosphere The Earth’s crust forms the upper part of the Lithosphere.
It is the solid topmost part of the Earth.
Asthenosphere:
Asthenosphere The layer directly beneath the lithosphere is called the asthenosphere.
The asthenosphere flows like thick tar, and therefore has plasticity.