astronomy questions...........?

Question

Without the Greenhouse Effect operating in our atmosphere,
we would not have to worry about any warming problems in the future.
Earth would have an average temperature of -23 degrees Celsius.
the ice in the polar regions would have melted long ago.
the ozone layer would not be weakening.
the Earth would have become much more like Venus long ago.



Question 3 2.5 points Save
Seismic waves are most useful for mapping
the surface of Venus with Magellan.
the surface of Mars with Global Surveyor.
the Earth's core and mantle.
the density of the hydrosphere.
the depths of the oceans.



Question 4 2.5 points Save
The presence of a magnetic field is a good indication that
the Earth's interior is similar to Mercury's, as both have fields.
a huge iron meteorite lies somewhere high up in the mantle, not in the core.
we have a liquid metal outer core, spinning rapidly as we rotate.
the Earth's interior must be completely molten to the center.
the Earth's interior has had time to solidify, with a rigid bar magnet created.

Answer 1

You have told us everything but missing out the most important, what is your question?

Answer 2

Without the Greenhouse Effect we would not have to worry about warming problems in the future. (somewhat not true)

Seismic waves are most useful for mapping the Earth's core and Mantle. Mars has very little going on inside seismically, as far as we know.

The presence of a magnetic field is a good indication that we have a liquid metal outer core spinning rapidly as we rotate.

Answer 3

What is your question ???????????