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Of the four gases CO2, H2O, N2, and O2, which are greenhouse gases? CO2 and H2OWhy are there no impact craters on the surface of Io? Io did have impact craters but they have all been buried in lava flowsWhy do asteroids and comets differ in composition?Asteroids formed inside the frost line, while comets formed outside.How do asteroids differ from comets?Asteroids are made of rocky material. Comets are made of icy materialWhich of the following is not a characteristic of the inner planets? They all have substantial atmospheres.The average age of the surface of Venus has been determined primarily from: the number of impact craters per unit area of surface.In what ways is Earth different from the other terrestrial planets?What do we mean by accretion in the context of planet formation?The growth of planetesimals from smaller solid particles that collided and stuck togetherA typical shooting star in a meteor shower is caused by a ________ entering Earth's atmosphere.pea-size particle from a region of the planet, but few smaller craters have formed on top of it. From this we conclude thatthe Caloris Basin formed toward the end of the solar system's period of heavy bombardment.What is Eris?An icy object that orbits in the Kuiper belt that the terrestrial worlds underwent differentiation?When their interiors were molten, denser materials sank toward their rings. What would you see as you looked down on the rings? Countless icy particles, ranging in size from dust grains to large isVenus.From center to surface, which of the following correctly lists the interior layers of a terrestrial world?Core, mantle,