The first principle you need to understand about geologic time is that the laws of nature are always the same. This means that the laws describing how things work are the same today as they were billions of years ago. For example, water freezes at 0°C. This law has always been true and always will be true. Knowing the natural laws helps you think about Earth’s past, because it gives you clues about how things happened very long ago. It means that we can use present-day processes to interpret the past. Imagine you find fossils of sea animals in a rock. The laws of nature say that sea animals must live in the sea. That law has never changed, so the rock must have formed near the sea. The rock may be millions of years old, but the fossils in it are a clue for us today about how it formed.
Now imagine that you find that same rock with fossils of a sea animal in a place that is very dry and nowhere near the sea. How could that be? Remember that the laws of nature never change. Therefore, the fossil means that the rock definitely formed by the sea. This tells you that even though the area is now dry, it must have once been underwater. Clues like this have helped scientists learn that Earth’s surface features have changed many times. Spots that were once covered by warm seas may now be cool and dry. Places that now have tall mountains may have once been low, flat ground. These kinds of changes take place over many millions of years, but they are still slowly going on today. The place where you live right now may look very different in the far future.
Scientists formed the geologic time scale after scientists observed changes in the fossils going from oldest to youngest rocks. Also the Scale was organized by scientists and also verified. Now imagine that you find a rock with fossils of old bones near a big lake. Back in the Precambrian time there might not have been water there but instead trees and a forest. Over time those trees are going to rot because the Tectonic Plates moved and went lower then water level so then water started coming up and rotting the trees. In those next 100 years this went on until there were no trees and there was the big lake that you are now standing by.
Explanation:
I got a 93 so reeeee..... dont copy directly. trust me you are gonna want to change a bit up these teachers are hackers and know everything
Ngl i took a little out of the one from above but... its very little
Human activities such as pollution , like trash , or boat oil can effect the waters that house 100 of creature and as for nitrogen cycle things like forest burning and fossil fuel combustion can result in the increased deposition of nitrogen from atmospheric sources
