WorksheetsExploring Saltwater Habitats
Total questions: 7
Worksheet time: 4mins
What percentage of the Earth's surface is covered by saltwater?
About 50%
About 60%
About 70%
About 80%
Which of the following is NOT a characteristic of a saltwater ecosystem?
High salinity
Low oxygen levels
Abundant sunlight
Freshwater input
Coral reefs are an important part of saltwater ecosystems. What role do they play?
They provide habitats for many marine species
They are the primary source of salt in the ocean
They give humans a place to mine for minerals
They absorb carbon dioxide from the atmosphere
How many different species of animals live in the oceans
1.3 B
228,000
1900
130,000
Which of the following is a common adaptation of marine animals to saltwater environments?
Fur for insulation
Gills for breathing underwater
Wings for flying
Long legs for walking on land
Which of the following human activities poses a threat to saltwater ecosystems?
Recycling
Overfishing
Planting trees
Using renewable energy sources
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