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Question
Because the early Earth was a large sphere of magma, the earliest rocks that formed here were recycled into the mantle long ago. What is the age of the oldest radiometrically dated rocks discovered on the planet? (Or, what is the age of the oldest remaining rocks on Earth?)A) 6,000 years old
B) 4.6 million years old
C) 4 billion years old
D) 4.6 billion years old
Answer
This answer is hidden. It contains 1 characters.
Related questions
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Rivers in the Pacific Northwest are heavily managed by the construction of dams and reservoirs in order to produce hydroelectric power and, in some areas, for irrigation. However, the construction of interior dams can have serious consequences for the coastal erosion of beaches and rocky bluffs along the Pacific Coast. How can the construction of these dams lead to the erosion of a rocky coastal bluff?
Q:
Rip currents are the result of tidal variations.
Q:
Black sand beaches in Hawaii were created by the erosion and deposition of coral.
Q:
Beaches are locations along the shoreline where excess sediment has accumulated on shore.
Q:
Which of the following coastal features is not a characteristic of a submergent coastline?
A) Barrier islands
B) Estuaries
C) Wave-cut platform
D) Irregular coastlines
Q:
The erosional retreat of a coastal cliff will lead to the enlargement of a ________.
A) wave-cut arch
B) wave-cut beach
C) wave-cut stack
D) wave-cut platform
Q:
Which of the following deposition/erosion scenarios will develop when a groin is constructed on the beach?
A) Erosion on upcurrent and downcurrent sides
B) Erosion on upcurrent side and deposition on downcurrent side
C) Deposition on upcurrent and downcurrent sides
D) Deposition on upcurrent side and erosion on downcurrent side
Q:
A ________ is a hard shoreline stabilization feature, detached from the shoreline, that protects shorelines from the pounding of waves by creating an area of quiet water behind it.
A) groin
B) seawall
C) breakwater
D) jetty
Q:
Which of the following locations has a coastline famous for its depositional features such as barrier islands?
A) Northern California
B) Baja Peninsula, Mexico
C) Oregon
D) North Carolina
Q:
What term describes the bending of waves?
A) Reflection
B) Oscillation
C) Refraction
D) Frequency
Q:
Circular orbital motion in waves will occur in ________ water.
A) still
B) deep
C) shallow
D) evaporating
Q:
What is a berm?
A) A flat-topped platform of sand adjacent to dunes or cliffs
B) Area landward of the high-tide shoreline
C) Wet, sloping surface of the beach
D) Build-up of sand where a stream meets the sea
Q:
What feature is present in this image?
A) Blowout
B) Yardang
C) Desert pavement
D) Dune
Q:
Explain how the environmental conditions in the headwaters of the Colorado River affect the longevity of the river as it moves through the desert.
Q:
Explain how circulation patterns in the atmosphere generate the bands of low-latitude deserts around the equator.
Q:
Why is erosion by wind more effective in an arid region than in a humid region?
Q:
Streams in arid regions are generally small and die out before reaching the sea. Explain two ways that streams lose water in this environment and why this loss occurs.
Q:
Due to the lack of chemical weathering, there is a great deal of clay-sized sediment in desert areas.
Q:
Middle-latitude deserts and steppes are more numerous and extensive in the Northern Hemisphere than in the Southern Hemisphere.
Q:
What process creates desert blowouts?
A) Moving water
B) Evaporation
C) Herd animals pawing at the ground
D) Deflation by wind
Q:
________ weathering is most common in a desert environment.
A) Mechanical
B) Erosional
C) Chemical
D) Dissolution
Q:
What is the definition of an ephemeral stream?
A) A distributary channel on a stream delta
B) A stream that meanders back and forth across a valley
C) A stream that has interweaving channels and is choked with sediment
D) An intermittent stream that only has water after specific episodes of rain
Q:
Which crevasse will form parallel to the terminus as a glacier moves over a change in slope?
A) Bergschrund
B) Longitudinal
C) Transverse
D) Moulin
Q:
Which of the following ice bodies is an example of alpine glaciation?
A) Valley
B) Ice Sheet
C) Ice Cap
D) Iceberg
Q:
How did erosion shape this glacial feature? (Hint: It is bedrock.)
A) Frost wedging
B) Plucking
C) Abrasion
D) Plucking and abrasion
Q:
Which method of glacial erosion is responsible for the marks in this image?
A) Abrasion
B) Plucking
C) Quarrying
D) Jointing
Q:
Glacial Lake Agassiz went through many periods of catastrophic drainage starting at 13,000 years ago. Some of these periods of catastrophic change have been linked to periods of cooling climate, particularly when the lake drained through the St. Lawrence Seaway and into the North Atlantic. How would the drainage of Lake Agassiz affect the climate to such a degree that cooling would result?
Q:
The Mississippi River currently makes up the western boundary of the state of Illinois. However, the Ancient Mississippi River Valley once flowed through the center of the state, cutting off one-quarter of the state from its modern boundaries. How did the Mississippi River shift from its ancestral location to its present one? How did it end up staying in its current location? Explain.
Q:
Evaluate the following statement: "Continental ice sheets generally subdue their landscapes, whereas alpine glaciers accentuate them."
Q:
Sea level rises during a glaciation because glaciers are pushing down on the crust, which deforms the ocean basins.