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How does magma form?

Magma can be described as melted rock deep within the Earth, usually originating from the melting of the upper mantle or crust. The magma will generally contain silica tetrahedra as well as many metal cation...
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Answered by Alfie B. • Geology tutor
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What is palaeomagnetism?

Palaeomagnetism is a record of the Earth’s past magnetic field. When lava is erupted at the surface, magnetic minerals, such as iron, in the lava align parallel with the Earth’s magnetic field. The magnetic ...
LA
Answered by Lucy A. • Geology tutor
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state the difference between a normal and a reverse fault

A normal fault is a fault that involves extensional movement along its fault plane, this involves the hanging wall moving down in relation to the footwall. A reverse fault involves contraction along its faul...
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Answered by Laurence W. • Geology tutor
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Which fossil group will show 5-fold (Pentameral) symmetry, is composed of plates, a mouth and an anus on opposite surfaces?

Echinoids. They belong to the same phylum (Echinodermata) as Crinoids. This classification is defined by an organism showing 5-fold symmetry.
JF
Answered by Jennifer F. • Geology tutor
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Discuss the successes and failures of China's population policy since the 1990's. (8 marks)

To achieve the highest marks, both successes and failures must be discussed explicitly and in depth, not just listed, which would limit you to half marks. Remembering two or three figures can make your answe...
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Answered by Natalie H. • Geology tutor
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