Bays form where weak -LRB- less resistant -RRB- rocks -LRB- such as sands and clays -RRB- are eroded , leaving bands of stronger -LRB- more resistant -RRB- rocks -LRB- such as chalk , limestone , granite -RRB- forming a headland , or peninsula .

Bays form where weak rocks , such as sands and clays , are eroded , leaving bands of stronger rocks , such as chalk , limestone , or granite , forming a headland , or peninsula .
