What is the blag hypothesis in regards to changes in atmospheric carbon concentrations?
What is the blag hypothesis in regards to changes in atmospheric carbon concentrations?
The central feature of the BLAG hypothesis is the concept that changes in the average rate of seafloor spreading over millions of years have controlled the rate of delivery of CO2 to the atmosphere from the large subsurface rock reservoir of carbon and that the resulting changes in atmospheric CO2 concentrations have …
How well does the blag hypothesis explain the last 50 Myr of cooling?
How well does the BLAG hypothesis explain the last 50 Myr of cooling? There was a slower rate of seafloor spreading and subduction rates and this led to slower rates of CO2 input into the atmosphere. Less CO2 in the atmosphere leads to cooling.
What is the uplift weathering hypothesis?
Research. Raymo is known for developing (along with William Ruddiman and Philip Froelich) the Uplift-Weathering Hypothesis. According to this hypothesis, tectonic uplift of areas such as the Tibetan plateau has contributed to surface cooling.
What role does chemical weathering play in the blag hypothesis?
What role does chemical weathering play in BLAG hypothesis? It relies on chemical weathering to moderate any fluxes in climate driven by changes in volcanic CO2 input. Most of the material available to weather in the Amazon has already been heavily weathered (clays).
What is the polar position hypothesis?
The Polar Position Hypothesis. ❑ The polar position hypothesis focused on latitudinal position as a cause of glaciation of continents. ❑ This hypothesis suggested that ice sheets should appear on continents when they are located at polar or near-polar latitudes.
Which of the following are examples of chemical weathering?
Some examples of chemical weathering are rust, which happens through oxidation and acid rain, caused from carbonic acid dissolves rocks. Other chemical weathering, such as dissolution, causes rocks and minerals to break down to form soil.
What are the five main greenhouse gases?
The main gases responsible for the greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapor (which all occur naturally), and fluorinated gases (which are synthetic).
Did asteroid impacts have long lasting effects on climate quizlet?
No, Glaciations is now thought to be the cause of lower sea level, not the result. Did asteroid impacts have long-lasting effects on climate? This depends on how people quantify “long” . There were effects that can be traced to a few hundreds of years after the impact, but in geological scale, that is not very long.
What is the connection between uplift and weathering?
When land is uplifted, geologic forces go to work on it to erode and wear the land down—a process called weathering. The Earth’s surface can be uplifted in several different ways. Earthquakes can fracture, fault, and uplift large sections of the Earth’s crust.