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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...
LW
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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What is the difference between a Normal Fault, a Reverse Fault, and a Strike-Slip Fault?

Normal Faults and Reverse Faults are "Dip-Slip" Faults - they experience vertical movement, in line with the dip of the fault. They are identified by the relative movement of the Hanging Wall and F...
JT
Answered by Joseph T. • Geology tutor
89627 Views

Why is heat flow over a mid-ocean ridge higher than over an oceanic trench?

To understand the answer to this question we must first consider the dynamics and structure of each of these plate margins. Oceanic trenches form at subduction zones. At a subduction zone dense oceanic crust...
LH
Answered by Lewis H. • Geology tutor
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