Understand that the four planets closest to the Sun are small and rocky, while the four farthest are large and gaseous, and explain this distinction using the accretion model of Solar System formation, which includes: (a) the role of gravity, (b) the variety of elements in interstellar gas and dust clouds, and (c) the rotation of material leading to the formation of an accretion disc.

Quick explanation

Understand that the four planets closest to the Sun are small and rocky, while the four farthest are large and gaseous, and explain this distinction using the accretion model of Solar System formation, which includes: (a) the role of gravity, (b) the variety of elements in interstellar gas and dust clouds, and (c) the rotation of material leading to the formation of an accretion disc

• This point belongs to The Solar System, especially The Solar System outcomes.
• You need to be able to understand that the four planets closest to the Sun are small and rocky, while the four farthest are large and gaseous, and explain this distinction using the accretion model of Solar System formation, which includes: (a) the role of gravity, (b) the variety of elements in interstellar gas and dust clouds, and (c) the rotation of material leading to the formation of an accretion disc.
• The key ideas to know are Explain, Compare, and Know.
• Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.