The principle of cross-cutting relationships states that the intrusions are younger than the rock they cut.
Number the pictures from one to five with one being the oldest and five being the youngest.
Below each picture, choose the process that is taking place in the box above.
The USGS has a good introduction of Relative Dating to have you practice putting historical events in the correct order.
Rock layers represent "historical events," so a rock layer is like a page in the book of Earth's geologic history. There are five different pictures of one rock sequence throughout time.
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The Scottish geologist James Hutton (1726-1797) argued that granite and basalt by solidification within the earth (as opposed to precipitating in from oceanwater).
This idea is known as Plutonism, in reference to the God of the deep underworld.
This means that you know which events came first, but not the exact time when they happened. Scientists use the fossils of animals to help determine relative age.
Imagine that throughout your life youve taken many pictures. Certain groups of fossil animals and plants occur in the geologic record in a specific order.
Choose your answers to the questions and click 'Next' to see the next set of questions.