A 6.0x102 g sample of water at 90.0°C is mixed with 4.00x102 g of water at 22.0°C. What is the final temperature of the water

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places