<human>:  Why is the island of Alderney called Alderney?
<bot>: Alderney is an island in the English Channel. It is part of the Bailiwick of Guernsey. The name Alderney comes from the Old English Alderney, which means "alder island". Alderney is an island that is made of clay, sandstone, and limestone. It is home to a large number of plant species and wildlife.