NASA | In The Zone

Phytoplankton are crucial for life on Earth, relying on light and nutrients for growth. Ocean processes and satellite technology help study their distribution. Human activities can disrupt their natural rhythms, leading to dead zones that harm marine life. Satellites like Seawifs monitor these changes, highlighting the impact of human and natural factors on Earth's ecosystems.

What are the primary factors that enable the growth of phytoplankton in ocean waters?

• Wind and tides

• Light and nutrients

• Temperature and salinity

• Pressure and depth

How do satellites help in the study of phytoplankton?

• By detecting marine life

• By observing ocean color

• By tracking ocean currents

• By measuring ocean temperature

What is a dead zone, and how is it formed?

• An area with low light, resulting from water pollution

• A region with low oxygen, caused by excessive phytoplankton growth

• A zone with high pressure, due to deep ocean currents

• An area with high salinity, formed by evaporation

Which human activity is primarily responsible for the creation of dead zones?

• Deforestation

• Oil spills

• Overfishing

• Fertilizer runoff

What role do satellites play in understanding the Earth's changing environment?

• They monitor the biological consequences of environmental changes

• They measure the Earth's gravitational field

• They track the migration of marine species

• They provide data on atmospheric pressure