What happens to the total mass pf the chemicals involved in the reaction as the reaction proceeds

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Light waves can move through , but they travel fastest when they move through a(n) .

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.