1.1 Structure of the Earth

What is the composition of the oceanic crust?

What is the age of the oceanic crust?

The density of the continental crust is 2.7 g/cm3.

The average thickness of the oceanic crust is [blank_start]7km[blank_end].

The average thickness of the continental crust is [blank_start]35km[blank_end].

Partial melting is where a proportion of the [blank_start]minerals[blank_end] in a rock have a lower [blank_start]melting point[blank_end] allowing them to melt whilst the rest remain solid.

What minerals are peridotite composed of?

Peridotite is an ultramafic igneous rock with a [blank_start]coarse[blank_end] crystal grain size.

Properties of the [blank_start]lithosphere[blank_end]: - It is made up of the crust and top part of the upper [blank_start]mantle[blank_end]. - High geothermal gradient - It is [blank_start]solid[blank_end]. - It is made of igneous, metamorphic and sedimentary rocks. - P and S waves gradually [blank_start]speed up[blank_end] with depth. - Density 2.7 to [blank_start]3.3[blank_end] g/cm3.

What depth is the lower mantle?

What is the depth of the inner core?

What is the depth of the upper mantle?

Complete the table to show each layer of the Earth with its approximate composition.