Tutor profile: Hannah H.
How do Geologists sequence the formation of rocks in relation to each other?
Geologists follow the Law of Superposition to approximately date the formation of rock structures in reference to each other. This law states that the oldest rocks must have formed first, in order to allow new rocks to form on top of those. It also states that these rocks formed in parallel bands and that any weathering, fracturing, or upturning must have occurred after the rocks had formed.
Subject: Earth Science
What evidence do we have that all of Earth's continents were once fit together into one supercontinent, often referred to as Pangea?
There are many indicators that support the theory that Earth once had a supercontinent. One of the most convincing is the pattern of fossils found in certain bands of the same species across many of our current continents. When the continents are places together, like puzzle pieces, to where Pangea was thought to have been shaped, these fossil bands align and show where communities of prehistoric animals once were. This evidence shows that these communities died and fossilized before continental drift occurred.
What determines if something is living or nonliving?
Based on Robert Hooke's Cell Theory, the identifying feature of all living beings is the presence of cells. Although there is a difference in the makeup, function, and organelle presence between plant and animal cells, both plants and animals can be deemed "living" due to the presence of Eukaryotic cells.
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