Start 6 relative dating laws

6 relative dating laws

The Periodic Table is a list of 108 known elements arrange by atomic number (see Figure 2-6).

Stone is another common term used to describe rock. Figure 2-2 shows how minerals can be combined to form different kinds of rocks that form under different environmental conditions.

The mineral composition of a rock reflects the physical environment and geologic history where a rock formed.

This isn't directly looking at a real life ecological example kind of thing, but it requires knowledge of relative dating, so I thought I would come here. Using principle of cross-cutting relationships, order from oldest to newest here is A, G, I, ((E, B) or (B, E)) Then I looked at the worms to the earthquakes. Since B breaks all of the "worms" but E only breaks through four of the five "worms," we can place the cracks as, from oldest to youngest A, G, I, E, B Then I started to place the "worms" between the cracks using principle of cross-cutting relationships.

Here is what was told: -"Worms" (curved lines) tunnelled through a block of material that used to be rectangular. I got in the end (oldest to youngest): J, A, G, I, F, E, C, B - D and H cannot be placed for certain.

Everything around us is made of chemical compounds that have testable and identifying characteristics, allowing them to be classified, and their age determined.

This also applies to rocks, minerals, and derivative materials (such as sediments and soil).

Slow processes creating rocks can be inferred by observing reefs growing in the oceans, or sediments being carried by flowing water in streams or moved by waves crashing on beaches.

We can see sediments being deposited, but we cannot see them turning into stone because the process may take thousand or even millions of years.

It is conceptually important that each rock has an origin in concepts of place, time, and physical and chemical conditions. These changes may be rapid (such as a volcanic explosion) or gradual, taking place over millions or billions of years, and involving movement over great distances, both at the surface or to deep within the Earth's crust below us.

Trying to explain the what, how, and when of a rock's journey is fundamental to explaining why rocks are significant to resolving questions about our Earth's history and conditions within the physical environments where we live.

This chapter is an introduction to rocks and minerals, and the rock cycle.