Why did the inner planets which contained large percentages of heavy elements such as iron and mickel lose their less dense gases?

What is it called if any large mass of ice moves slowly over land? The agent of erosion responsible for the removal of the majority of sediment is? What are the three characteristics of the stratosphere layer for the Concorde to travel? What are component of colloids? What do resting and action potentials depend on? What is socio gram and example? Naturally acquired passive immunity would involve the? If you put sugar into a glass of water the sugar will do what? What happens when a sample of water turns into ice? Are ribbons flamable? What holds more 1pt or 2c and 4fl Oz? Do fish produce hydrogen as a waste product? How can organisms have the same DNA but look and act differently? What are the factors to be considered during material selection? What animals has Jane Goodall worked with the most? What person studies plant functioning? State two dangerous condition other than high hurricane winds that could cause human fatalities as a strong hurricane strikes the coast of north america? Why would a 1998 Ford Ranger XLT 4x4 get stuck in 4 wheel high? Why branches of trees move and bend freely in high wind velocity? Do some non living things have characteristics of living things?

Why did the inner planets which contained large percentages of heavy elements such as iron and mickel lose their less dense gases?