Puzzle 4

Mental acuity

Committed; devoted

Tennis playing surface that is not grass or clay

Build-up of chalky calcium carbonate

Area of medicine dealing with hearing

Powerful central computer

"Oh, the weather outside is __" Let it Snow lyrics

Network that links organisms to predators

Shed table for DIYers

Small whirlwind over land

They built pyramids in Africa

Personal effects that have financial value

Someone employed in disaster relief, say

Beehive, dreadlocks, quiff are all types of this

To obtain contract work from a foreign company

Large rodent with quills

Fast; moving at a rapid pace

Country where the island of Bali is located