Is it OK? – thousands of egg-shaped ice balls covering a beach

Grade level: 3rd-5th grades

Skills: measurement (length/mass)

Related environmental issues: climate change

It was reported that a beach in Finland was covered by thousands of egg-shaped balls of ice in the beginning of November, 2019. Experts said that it is a rare weather phenomenon. They ranged from the size of an egg to the size of a football.

1. The length of an egg is 2 inches. The length is a football is one foot. How many times is an football longer than an egg?

2. The weight of an egg is 2 ounces. The weight of an football is one pound. How many times is an football heavier than an egg?

Source) BBC News, Nov 7, 2019. ‘Ice eggs’ cover Finland beach in rare weather

Answer keys

1. 6 times. (12/2=6)

2. 8 times (16/2=8)


How extreme can ocean waves be?

Grade level: 4th – 6th grades

Skills: Measurement (Length) 

Related environmental issues: Climate Change

A research found that extreme ocean winds and wave heights have been increasing around the world over the last 30 years. The researchers warned that we would see more serious and frequent coastal flooding in the future if this trend continues.

  1. During extreme storms, ocean waves can be 20 meters high. 1 meter is equal to 3.28 feet. What is the wave height in feet?
  2. The height of each story of building is around 14 feet. The height of the extreme is as tall as how many story building?





Answer keys

  1. 65.6 feet (20 x 3.28 = 65.6)
  2. 5 story building (65.6 ÷ 14 = 4.69)