What does the acronym KREEP stand for in lunar geology?
KREEP stands for potassium, rare-earth elements, and phosphorus. This geochemical component describes specific lunar rocks with unusual chemical signatures.
Questions about KREEP
Short answers, pulled from the story.
When did the collision that created the Moon occur according to the script text?
A rocky planet the size of Mars struck Earth approximately 4.5 billion years ago. This event threw broken rock into orbit which eventually gathered together to form the Moon.
Where are KREEP deposits primarily located on the Moon surface?
Measurements from the Lunar Prospector mission show these rocks concentrate underneath Oceanus Procellarum and Mare Imbrium. This unique geological province is now known as the Procellarum KREEP Terrane.
Why do volcanic eruptions last longer nearside of the Moon compared to other regions?
The enhancement of heat-producing radioactive elements drives volcanic activity across the nearside of the Moon. Radioactive decay generates internal heat over billions of years which keeps magma molten for extended periods.
How much potassium and phosphorus oxides does a typical KREEP sample contain by mass?
A typical sample contains about one percent by mass of potassium and phosphorus oxides. Rubidium levels reach between 20 and 25 parts per million while lanthanum concentrations measure 300 to 350 times higher than values found in carbonaceous chondrites.