How many non-native marine species were found in Galápagos islands?

Grade level: 6th grades

Skills: Percentage and addition

sRelated environmental issues: Biodiversity

The Galápagos islands, which lie in the equatorial Pacific, have long been recognized for their remarkable biodiversity and their large number of endemic species.  However,  the environment of the Galápagos islands started to change because many non-native species have been brought to the islands by human activity over the last 500 years.

galapagos-islands1.jpg

A recent research identified 53 non-native marine species in the islands.

  1. The research showed that 93% of the 53 species were likely brought to the Galápagos Islands by ships. How many non-native marine species were brought by ships? Round to the nearest whole number.
  1. The Galápagos islands were first visited by Europeans in the 1500s. By the late 1960s, 2000–3000 people lived on the Islands. In a 2010, there were 25,000 residents and one-quarter million visitors annually. Together, how many residents and tourists a year are there in the Galápagos islands?

 

Answer keys

  1. 49 species (53 x 0.93 = 49.29)
  2. 275,000 (25,000 + 250,000= 275,000)

 

How big is the wilderness land protected by President Trump?

Grade level: 4th – 6th grades

Skills: Division (large numbers)

sRelated environmental issues: Biodiversity

President Trump passed the wilderness preservation law on March 11, 2019. With the legislation, 1.3 million acres of federal land in California, Oregon, Utah, and New Mexico will be protected from logging, oil drilling, mining, and road-building.

  1. Death Valley, California

    Death Valley, California  (Photo credit: ROBYN BECK)

  1. Former President Obama passed the law to protect 2 million acres of wilderness across the West in March 2009. With the both laws, how many acres of land is protected from logging, oil drilling, mining, and road-building?
  2. The size of Rhode Island is 750,000 acres. How many times is the area protected by the two presidents larger than the state of Rhode Island?

Sources: East Bay Times, March 15, 2019. 

Note) The actual size of Rhode Island is 775,680 acres.

 

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Answer keys

  1. 3.3 million acres (1.3 + 2 = 3.3)
  2. 4.4 times (3,300,000 / 750,000 = 4.4)