Answer:
a and c
Explanation:
Basalt pillows occur when the basalt flows into the sea and the hot lava's contact with the cold sea water, the thermal shock, shapes the basalta into a rounded (pillow-like) shape, cooling the surface while a mass of Basalt is kept inside. For this reason, we can say that basalt pillows are an underwater shape, characterized as lens-shaped masses surrounded by cooled shells.
When there is seafloor spreading, it means that two plates C.)are moving away from each other creating ridges.
<h3>What causes seafloor spreading?</h3>
Seafloor spreading only happens in divergent boundaries between plates which means that the plates are moving away from each other.
When this happens, ridges are created as less-dense material rises from the mantle which leads to land being formed.
Find out more on seafloor spreading at brainly.com/question/870586
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Answer:
Superposition --- C. the oldest is on the bottom, the youngest on top.
Cross-cutting relationships --- B. faults, fractures are younger than the rocks they cut through.
Unconformities -- D. missing time
Original horizontality -- A . sedimentary layers/lava flows are deposited in flat layers.
Explanation:
- The superimposition is the layering of the older beds of the sedimentary rocks and has a series of a layer of the lava flows with the oldest layer at the bottom and the youngest at the top.
- The cross-cutting is the principle of geology that states the which feature cuts the another or the younger of them and is a relative dating technique.
- An unconformity is a buried erosional or a non-depositional surface that is separating the two rocks masses or the stratas and thus indicates that the sediment deposits were not continuous.
- The principle of the horizontality states that the layer of the sediments is originally deposited horizontally under the action of gravity a thus this analysis helps in the folded and tilted strata.
