very fine-grained volcanic ash deposited in an ancient lake
Which of the following would retain the most detailed impressions of fossilzed organisms?
Imagine a mountain stream whose fast-moving water has carried away all grains except for well-rounded pebbles, cobbles, and boulders. If such stream gravel were lithified, it would turn into
calcite grains grow larger and form interlocking crystals
What major change occurs during metamorphism of limestone to marble?
Which low-grade metamorphic rock, composed of very fine-grained minerals, is dull, and is fissile?
Which rock is thought to form by the partial melting and crystallization of the melted portion within the rock?
high temperatures associated with meteorite impacts
Tektites originate in what metamorphic environment?
Which of the following rocks is a nonfoliated rock formed by contact metamoprhism of shale or mudstone?
at great depths in the crust where two continents are colliding, forming mountains
In which setting would regional metamorphism be most likely?
prolonged and intense rainfall
What was the main factor for the landslide at la conchita, Ca in 2005?
by type of material, velocity and type of motion
In general, how are mass wasting processes classified?
The soil expands and contracts, lifiting particles and dropping them at a slight distance downslope
How do freeze- thaw or wet- dry cycles contribute to soil creep?
The natural channel had a lower gradient and higher friction than the straight channel
A natural, meandering river channel is modified into a more or less straight and smooth, canal-like channel.
The channel width times the channel depth times the velocity
What is the correct definiton of stream discharge?
infiltration decreases; runoff increases
How does urbanization affect infiltration and runoff and infiltration in a small, previously forested, drainage basin?
a BLANK stream pattern developes on lands underlain by tilted or folded, alternating hard and soft sedimentary strata
v-shaped cross-valley profiles
BLANK are characteristics of downcutting streams and youthful stage of valley evolution
Evaporation and transpiration
What are the components of the hydrologic cycle that release water vapor directly to the atmosphere?
on the outer parts of the meander loops, cut bank
Where is erosion concentrated along a meandering stream?
it increases in maximum diameter nine times
If the velocity of a stream triples, how does this affect its competence?
Zone of soil moisture
What is the term for the zone where water is held by molecular attraction to soil particles?
the surface is irregular and is influenced by rainfall variation
What is true about the surface of the water table?