6. When we look at Saturn, we only see its cloud tops.which are mostly __ a. ammonia b. methane c. hydrogen d. helium

## Step 1<br />The question is asking about the composition of the cloud tops of Saturn, which is the outermost layer of the planet. <br /><br />## Step 2<br />Saturn's cloud tops are primarily composed of ammonia ice crystals. This is because the temperature at these high altitudes is extremely cold, which allows ammonia to exist in solid form.<br /><br />## Step 3<br />The other options, methane, hydrogen, and helium, are not the primary components of Saturn's cloud tops. Methane is a minor component of the atmosphere, while hydrogen and helium are the primary components of the planet's atmosphere, but not the cloud tops.