Eventually, when large amounts of heat were trapped, the pressure from hot magma

Question

Eventually, when large amounts of heat were trapped, the pressure from hot magma was more than the crust could stand, and there was a phase of global volcanic activity called "catastrophic resurfacing" that covered over all the older surfaces and created vast lava plains and the volcanic features you observed. Venus has almost no "flat-floored" craters like you saw in the Moon lab. What does this tell you about how thick the lava plains are and how much lava must have flowed during the "catastrophic" volcanic event(s)? Explain your reasoning.

Explanation / Answer

As we all know the moon have one-sixth of the Earth’s gravity which implies that the forces driving lava flow are weaker on the moon thus, the very flat and smooth mare surface implies that mare lavas were very fluid, they could flow easily and spread over large areas along with the low gravity will allow the debris to move further on the moon. Eruptions on the moon should spread lavas into a broad flat layer and not into the cone-shaped features.
Whereas on Venus there is no tectonic plates or seawater and the volcanoes are of shield type, these volcanoes can cover hundreds of km in areas but they are somewhat flat with a height of 1.5 km. Larger volcanoes have caused Venusian lithosphere to flex downward because of the enormous vertical loads, producing flexural moats or ring around edifices. This can lead to the fracturing of the magma chambers in the sill-like pattern, affecting magma propagation beneath the surface. Novae and Arachnoids are also observed Nova is formed when a large amount of magma is extruded onto the surface to form radiating ridges and trenches which are highly reflective to radar, these dikes form a symmetrical network around the lava emergent point, they may also be depressed by the collapse of the magma chamber. Arachnoid resemble a spider web consisting several concentric ovals surrounded by a complex network of radial fractures similar to those of a nova. Its yeat to find this arachnoids shares a common origin or not or they have some other geological origin history.

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