- Dikes, sills, veins, and fractures are features that can be used in the principle of _____ to determine the relative age of geologic events
- Ancient rocks must be dated w/isotopes w/a _____ half-life
- What happens to an asteroid or comet that creates a crater when it impacts a planet or moon?
- The principle of _____ tells geologists that the oldest rock layer in the diagram is on the bottom; therefore, it was deposited first
- The principle of original horizontality means that flat-lying sedimentary rocks have not been _____
- Early Earth would have been inhospitable to many life-forms of today because the _____
- Before radioactive decay occurs, there exist 200 parent atoms. After one half-life, there would be _____ parent atoms and _____ daughter atoms
- The principle of inclusion states that the clasts within a conglomerate are _____ than the conglomerate
- Both ____ dating and ____ dating can be used for correlation of the rock units shown in the diagram
- Baking of rocks surrounding an igneous intrusion is called ____ effects
- Order the isotopic systems from best for dating the youngest materials to best for dating the oldest materials
- Preserved trackways and worm burrows in rock are examples of _____ ______
- Which principle of relative dating can be used at Siccar Point in Scotland to determine that the rocks below the unconformity were tilted to vertical before erosion occurred?
- _____ may form as erosion by a river further downcuts and widens a canyon, making a more intricate canyon formation
- Isotopic dating allows scientists to assign numeric ages to rock using the natural _____ decay to certain isotopes
- Name the materials that can be dated w/carbon-14 at archeology sites
- About 2 billion years ago, ______had produced enough oxygen through photosynthesis to form a protective layer of ozone in the atmosphere
- Buried erosion surfaces that represent large intervals of time are called ______
- Fossils of species that lived on Earth for a long time period are often found in _____, whereas fossils of species that lived for a shorter time are found _____
- River terraces are _____ than the age of the modern river channel