CK12 Earth Science

and with tremendous force (Figure10.49). Scientists believe that air gets trapped under the falling rocks and acts as a cushion ...

Figure 10.50: An avalanche of snow moves suddenly and quickly down slope, burying every- thing in its path. ( 36 ) Empire State ...

Landslides occur often in dry or semi-arid climates in areas with steep slopes or mountains. The California coastline, with its ...

This now hot water mixes with volcanic ash to produce exceptionally hazardous flows that move as fast as 60 km/hour. In Columbia ...

Figure 10.54: Material that slumps down a hillside often moves as a whole unit, leaving behind a crescent shaped scar. ( 3 ) way ...

Figure 10.55: Trees with curved trunks are often signs that the hillside is slowly creeping downhill. ( 15 ) ...

Lesson Summary Gravity moves earth materials from higher elevations to lower elevations. Landslides, avalanches and mudflows ar ...

Points to Consider Why might someone build a home on top of land where a landslide has happened before? Couldalandslidehappenan ...

(16) http://en.wikipedia.org/wiki/File:Matterhornnorth.jpg. GNU-FDL. (17) http://en.wikipedia.org/wiki/File:Yellowstone_p1100309 ...

(37) http://en.wikipedia.org/wiki/File:Sand_dune_formation.png. GNU-FDL. (38) http://en.wikipedia.org/wiki/File: Morocco_Africa_ ...

Chapter 11 Evidence About Earth’s Past 11.1 Fossils Lesson Objectives Explain why it is rare for an organism to be preserved as ...

Figure 11.1: Griffin (left) andProtoceratops(right). ( 1 ) Figure 11.2: Ammonite (left) and Elephant Skull (right). ( 23 ) ...

weight of 80,000 kg, equal to the weight of seven elephants! Other fossils, such as the trilobite and ammonite, impress us with ...

of them ever become fossils. To see why, imagine an antelope that dies on the African plain. Most of its body is quickly eaten b ...

Figure 11.5: Fossil shell that has been attacked by a boring sponge. ( 12 ) ...

Preserved Remains The most rare form of fossilization is the preservation of original skeletal material and even soft tissue. Fo ...

Figure 11.6: Five types of fossils: (A) Insect preserved in amber (B) Petrified wood (per- mineralization) (C) Cast and mold of ...

Exceptional Preservation Somerockbedshaveproducedexceptionalfossils. Fossilsfromthesebedsmayshowevidence of soft body parts that ...

of time. When a particular index fossil is found, the relative age of the bed is immediately known. Many fossils may qualify as ...

amount of wear and fragmentation of a fossil can allow scientists to estimate the amount of wave action or the frequency of stor ...