The Terrestrial Planets

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Presentation transcript:

The Terrestrial Planets

Terrestrial Planet Surfaces How do they compare to one another?

Earth most active geology volcanoes & tectonics moderate atmosphere N2 O2 H2O H2O exists in liquid state rampant erosion few craters life

Venus Has a thick, cloudy atmosphere -- you can not visually see the surface we must image the surface using radar smooth plains with few mountain ranges few craters many volcanoes and domes of lava (corona) Venus is very active with tectonics & volcanism

Venus is the planet most like hell. Searing heat, heavy pressure, clouds of sulfuric acid, frequent volcanic eruptions; as Carl Sagan said: Venus is the planet most like hell.

Volcanism & Tectonics on Venus Impact craters are evenly spread over Venusian surface. implies that the planet’s entire surface is the same age crater counting suggests an age of 1 billion years old Volcanism “paved over” the surface 1 billion years ago.

Volcanism & Tectonics on Venus The corona is a tectonic feature. rising plume in mantle pushes crust up cause circular stretch marks Plume forces magma to the surface. volcanoes are found nearby

this implies that Mars has seasons mountains & canyons volcanoes thin atmosphere (CO2) no plate tectonics ---volcanoes are higher evidence for water erosion Mars has a rotation period & axis tilt almost identical to Earth’s this implies that Mars has seasons look at the ice caps (CO2 & H2O)

Mars Olympus Mons the largest volcano in our Solar System it is located atop the Tharsis Bulge along with several other volcanoes

Four images of Mars in one Martian Day Summer in North, Winter in South

Evidence for Water

Spirit peeks over a ridge in Columbia Hills

Rovers on Mars

Dust Devils

evidence for (frozen) water within 1 meter under the surface this underground water is found all over the planet

Recent Water on Mars? Liquid water could exist temporarily with today’s temperatures and air pressures…in a flash flood! Underground water seeps out to form erosion gullies at their size, sandstorms would cover them in few million yrs

Seeps

Ice in Crater

Frozen Ice Floes?

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