A 1 on the Mercalli scale or below a 3 on the Richter scale is only measurable by these devices
When William Ramsay told of the discovery of this gas on Earth in 1895, we wonder if he used a squeaky voice
(Cheryl of the Clue Crew at the chalkboard) By adding two lines, I've turned a math symbol for division into a symbol for this
A hemoglobinometer measures the amount of hemoglobin in this
Brighter in the night sky than any star is this planet that comes closest to the Earth
The deepest diver among these birds is the emperor species of this, which may dive to 900 feet in the Antarctic waters
A grub is this soft, thick stage of metamorphosis of flies, wasps & beetles
It's the fossilized resin from pine trees
(Sarah of the Clue Crew in Alaska) This bovine name is given to the process whereby huge chunks of ice break off glaciers, giving birth to icebergs
This cloudy atmosphere containing the nucleus of a comet may reach a diameter of 1 million miles