Answer:
Layer B is older than intrusion A
Intrusion A is older than layers C, D, and E.
Layer B is older than layers C, D, and E.
Explanation:
The laws of biostratigraphy can be applied to this lithological section in order to ascertain the relative ages of the beds.
Some of these laws that are applicable to this problem are:
- Principle of superposition of strata : the oldest layer is always at the bottom of sequence while the youngest is on top in an undisturbed rock sequence.
- Law of cross-cutting: when faults and fractures cuts through a rock sequence, they are younger than the rock they cross through.
- Law of intrusions: Intrusions are younger than the rock layers they cut through
The geologic history of the beds here can be interpreted as thus:
- Lithology B was first deposited
- Then an intrusion A occurred and terminated at B
- Layers C, D and E were then deposited.
The oldest layer here is B followed by the intrusion A and successful deposition of C, D and E in that order.
D. Some European rivers act as international borders.
Hot and less dense material below the
Earth’s crust rises towards the mid-ocean ridge. A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.
<span>As this material flows sideways, it
creates a crack in the crust where magma will flow out. This magma cools down
and becomes the new seafloor.</span>
Answer:
They found evidence of an impact crater in Mexico
Explanation:
The K-Pg boundary is the boundary that separates two periods, but also two eras. The two periods that are separated by this boundary are the Cretaceous and the Tertiary, while the two eras are the Mesozoic and the Cenozoic. The boundary is marked by a mass extinction, and the scientists started to hypothesize as to why it happened. There were numerous different theories, but a clue in Mexico, or rather right next to the Yucatan Peninsula, shed new light on it. The scientists found an impact crater, formed either by a large asteroid or a comet. Such an impact would have easily caused sudden and drastic changes on the Earth, killing of the majority of the species. This impact released such a big amount of energy that it killed everything in the surrounding area in seconds. On top of that, it caused an extremely hot wave of air across the whole planet, killing many more organisms. It managed to trigger most of the volcanoes to erupt, as well as the earthquakes, causing also very large tsunamis. The sunlight got blocked for quite some time from all the aerosols in the atmosphere as well. This resulted in a mass extinction of the dominant species, like the dinosaurs, but it opened up the terrain for the evolution of the others, like the mammals.