Top answers

What is the Moho?

The Moho is the Mohorovicic Discontinuity. A seismic discontinuity is a boundary between 2 layers with different properties. The Mohorovicic discontinuity (Moho) is the crust - mantle boundary (within the li...
AK
Answered by Alex K. • Geology tutor
3381 Views

Fossils can be found pyritised. Describe and explain how pyritisation occurs.

Pyritisation is the replacement of original material by iron pyrites. The environment needs to be anaerobic, where the only live organisms are sulfur bacteria. This bacteria will then use the sulfur in the e...
HG
Answered by Harriet G. • Geology tutor
5034 Views

Describe the differences in internal morphology that can be seen between a Nautilus and Ammonite

in nautiloids septal necks are retrosiphonate (point towards the protoconch / centre OR away from the aperture)in ammonoids septal necks are mainly prosiphonate (point towards the aperture OR away from the p...
VG
Answered by Victoria G. • Geology tutor
2041 Views

Define the law of superposition

The law of superposition states that the oldest rocks in a stratigraphic sequence will be at the bottom, and age of each layer decreases as you move upwards (I.e. a layer in a sequence cannot be younger than...
HH
Answered by Henry H. • Geology tutor
4017 Views

Explain the features and differences between the icehouse and the greenhouse effect?

The globe can experience periods of warming, such as we are experiencing now in the Quaternary period, or it can experience cooling periods leading to ice ages, such as at the Ordovician-Silurian boundary. A...
AL
Answered by Annabel L. • Geology tutor
2785 Views