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Describe the processes which occur at a divergent plate boundary.

At a divergent (constructive) plate boundary, the Earth's plates move apart from one another. Magma originating from the mantle rises to the surface, forming new crust; this process generates convection curr...
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Answered by Ceri P. • Geology tutor
4513 Views

Discuss the formation of metamorphic rocks, including foliation development

Metamorphic rocks form when a rock of any classification (igneous, meta, or sed) is subjected to heat and/or pressure , resulting in recrystallisation. Contact metamorphism occurs around a crustal intrusion ...
AM
Answered by Amy M. • Geology tutor
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Explain how pillow lavas are formed and describe how they can be used as a way up structure

Pillow lavas are formed when lava is emitted from the earths crust under water. The outer layer cools rapidly and hardens while the inside remains soft. A round pillow like ball of malleable rock is formed a...
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Answered by James M. • Geology tutor
3355 Views

What are some hypotheses to explain the Permo-Triassic mass extinction? (when 95% of marine invertebrates and 77% of land species became extinct)

A mass extinction is a large decrease in the number of species over a relatively short period of time (several millions of years). The most likely cause of this species decline is the formation of the superc...
SJ
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Why does the Hjulstrom curve have its shape

As grains get larger, they require more energy from the transport medium to erode away.Larger grains are deposited at higher energies than smaller grains because they require an even greater amount of energy...
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Answered by Felix B. • Geology tutor
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