Noun. 1. volcanic crater-a bowl-shaped geological formation at the top of a volcano. crater. caldera-a large crater caused by the violent explosion of a volcano that collapses into a depression. geological formation, formation - (geology) the geological features of the earth.
A standard single bed is 3 feet wide and 6 feet 3 inches long (91 x 190). This is the most common bed size for children, kids beds and bunk beds. What size is a Small Double bed? 122 x 190 cm / 48 x 75 / 4' x 6'3. A small double bed refers to a 4 feet wide, 6 feet 3 inches long mattress (122 x 190 cm).
Standard full size mattresses in the United States also measure 54 inches wide and 75 inches long. Full size beds, also known as double beds, are only 15 inches longer than a single bed. Full size beds are smaller than queen and king size beds, and are ideal for a smaller room.