Formation of igneous, sedimentary, and metamorphic rocks:
Igneous- Cooled magma hardened above the earths surface.
Sedimentary- Formed by decomposition of weathered remains of other rocks.
Metamorphic- Formed by heat and pressure of different minerals being changed chemically.
The things that all these rocks have in common are they are all made up of other rocks and a heating process. The difference is sedimentary is the only one that begins forming in the water.
The sun plays a role in sedimentary rock formation because the rock expands and contracts as it heats up in the sun and cools down at night.
-The crystal size of an igneous rock that formed from magma and cooled at a faster pace would be smaller than the rock that cools gradually. This is because the slower the process the more time the minerals in the rock have to expand.
An example of a exponential decay graph is in the top left hand corner.
Here's a link to a video explaining the relative age of rocks and how to find them. The video is already set at the time where the answer to the question starts, so just play the video from there and end the video at 9:24.
https://www.youtube.com/watch?v=pkEPpGeCmcg#t=166
Igneous- Cooled magma hardened above the earths surface.
Sedimentary- Formed by decomposition of weathered remains of other rocks.
Metamorphic- Formed by heat and pressure of different minerals being changed chemically.
The things that all these rocks have in common are they are all made up of other rocks and a heating process. The difference is sedimentary is the only one that begins forming in the water.
The sun plays a role in sedimentary rock formation because the rock expands and contracts as it heats up in the sun and cools down at night.
-The crystal size of an igneous rock that formed from magma and cooled at a faster pace would be smaller than the rock that cools gradually. This is because the slower the process the more time the minerals in the rock have to expand.
An example of a exponential decay graph is in the top left hand corner.
Here's a link to a video explaining the relative age of rocks and how to find them. The video is already set at the time where the answer to the question starts, so just play the video from there and end the video at 9:24.
https://www.youtube.com/watch?v=pkEPpGeCmcg#t=166
To the left is a chart showing how ice cores determined that the temperature decreased over time as the level of carbon dioxide did. As the amount of carbon dioxide increased, so did the temperatures. The carbon dioxide recordings are in blue and the temp. is in red.
How to determine the age of a rock using half life data:
For example, if there had been 4 half lives,
Isotope Y is the parent. When an atom of isotope Y decays to its daughter, z, one atom of z is produced. So this means that the original amount of isotope Y was 31 + 469 = 500 parent atoms.
Now,
500/2 = 250
250/2 = 125
125/2 = 62.5
62.5/2 = 31.25... Which is the number of Y atoms to start with.
If each one of these half-lives lasts 10,000 years, then you multiply each step by 10,000 = 40,000 years
https://answers.yahoo.com/question/index?qid=20101025113421AALnS1v
http://www.enchantedlearning.com/subjects/Geologictime.html