You need the Library slip from the Mordred Museum. To get it, recover the Gold Coin from the fountain outside. Once you pay your entrance fee, you can find the Library Slip in the stack of books just right of the museum operator.
You dont use the key for the out of order sign. You go to the place where the windmill is at. Find 2 stacks of hay go in between them. You will find a round metal plate. Click on it Its locked. The take out the key and click USE. The plate will be unlocked. You can go in now. That is the use for the key for astro knights on poptropica.
Knights started wearing plate armor for better protection against arrows and weapons in battle. This armor increased their defense but also reduced their mobility. Additionally, plate armor allowed knights to display their status and wealth.
Earlier knights wore chain mail. Later knights started using plate armour and shields.
for protection
I belive a steel plate
Easter Island is located on a convergent plate boundary.
The African Plate
They would wear suits of metal plate armor, but early knights wore tough leather
The Pacific Plate
They have plate armor , weapons in weight of tons . And they are in horseback .
fuse box location
The 'South Island'. A collision boundary.