IN YOUR OWN WORD. describe how changes in the amount of ice covering Earth's surface can affect earth's temperature

If there is more ice on Earth's surface, more of the incoming radiation is reflected into space. If the radiation is reflected into space, it can't warm the Earth, so there is a cooling of the temperature. ... In this model, the cloud cover cools Earth's surface by reflecting radiation back into space

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus