3&4 Flashcards
(30 cards)
What happens to sediments carried by a river when they reach a lake
They spread out evenly on the lake bottom
What are four conditions that would allow older sedimentary rocks to be on top of younger sedimentary rocks
Faulting
igneous intrusions
Erosion
Folding
What causes folding
Compression - pushing them together
What forces cause faulting
Compression and tension
What would a layer of sedimentary rock with a fossils tell you about where it was formed
It was formed on the bottom of an ocean of lake
Which rock layer in a canyon, like the Grand Canyon, will usually have the oldest fossil? Why?
Layers located deep in the canyon because they are formed the longest time ago
What assumption do scientist make when using radioactivity dating technology
radioactivity element decay the same rate today as they decayed in the past
Describe a location that would be good for a bone or shall to become a fossil
Submerged in shallow water or mud
How does the fossil record tell you about the past of an area
It gives evidence of the climate, plants and animals that lived there.
What has to happen for sediment to become a rock
Minerals have to cement them together
In land-locked lowa coral was found in a geologic layer .what does that tell you about the geological history of this area
It was once a warm shallow ocean
What evidence do scientists have that support the idea that earths surface has changed over time
Fossils of rain forest plants that are deserts today
If a Santos had collected a bunch of fossils and wanted to know how old they were, what would they need
A chart showing to each and position of the Rock layers and the fossils found in them
Why do more recently deposited Rock layers contain fossils more like animals that are alive today
They died in more recently and are in newer rock layers.those animals haven’t had long enough to evolve
What is the source of energy for earthquakes volcanoes
heat from earths interior
if a volcano is going to erupt, what can scientist do to stop it
Nothing, a volcano starts from deep in the ground
Describe how a volcano transfers energy
heat and mechanical energy are transferred as magma flows from a volcano
What type of energy transfers causes an earthquake
Mechanical energy from fault that creates seismic waves
How does the energy released by volcano and earthquake affect people that are near them
It can hurt people and damage property
list at Least two ways that you could model an earthquake
A.and popsicle stick in till the break/stretch of rubber band until it snaps
B. Drop a rock into a pan of water and watch the waves travel outward
What must be added to three blocks for you to use them as a model oven earthquake
Energy by pushing them together , pulling them apart or sliding them side to side
Which of the blocks would have moved after you demonstrated an earthquake
The center block
Why was the information about the danger of faultlines overlooked
People overlook information they do not like or will cost them money
What would a geologist have recommended to the house owners before the house was built
Don’t build it there – it is too dangerous
