They
Of those listed below, the most important source of fixed nitrogen for marine organisms is:
the decomposing tissues of dead animals and plants.
artificial fertilizer runoff.
cyanobacteria.
atmospheric nitrogen.
What is cyanobacteria?
Choose the main agent of erosion or deposition.
moraine
Is it gravity, water, wind, or glaciers?
What is glaciers?
About what percentage of the earth's surface is covered by oceans?
71%
Choose the appropriate type of weathering.
humic acid from decaying plants
What is chemical?
True or False. The carbon and nitrogen cycles operate only in the ocean.
What is false?
Choose the appropriate type of weathering.
exfoliation
What is mechanical?
While minerals constantly flow into an ocean, the ocean’s salinity rises only very slowly. Where do most of the minerals go?
Organism take minerals from the seawater and evaporate along with the water from the ocean.
Choose the main agent of erosion or deposition.
mass wasting
Is it gravity, water, wind, or glaciers?
What is gravity?
The main natural source of fixed nitrogen that does not involve living things is __.
What is lightning?
Choose the appropriate type of weathering.
warmth and moisture speeding up reactions between natural acids and minerals
What is chemical?
In general, seawater temperature __ from the surface to the bottom.
What is decreases?
True or False. Minimizing the runoff of artificial fertilizers into the ocean is an important part of exercising biblical dominion of the ocean environment.
What is true?
Because clams, corals, and anemones are attached to or live on the bottom, we call them _____ organisms.
What is benthic?
How does the temperature, pressure, and density of water most likely change as you ascend from the floor of the ocean to the surface?
Temperature increases, pressure decreases, and density decreases.
Choose the main agent of erosion or deposition.
sand dunes
Is it gravity, water, wind, or glaciers?
What is wind?
Topsoil is found in the __ layer of soil.
What is A-horizon
Carbon in the atmosphere is typically in the form of __.
What is carbon dioxide?
Organisms that live between the low tide mark at the shore and the edge of the continental shelf live in the ________ zone.
What is littoral?
The term brackish is most closely related to the ___________ of a sample of water.
What is salinity?
Choose the appropriate type of weathering.
frost heaving
What is mechanical?
List at least three types of organisms that help to compose biological soil crusts in some very dry habitats.
bacteria, algae, fungi, lichens, and mosses.
Give at least three ways that our lives are dependent on the existence of oceans.
What is By absorbing the sun's heat, oceans affect the weather and support a livable climate. The abundant plant and animal life provide food. Most of our oxygen comes from ocean life. Fresh water can also be obtained from the oceans.
Biological __ are essential to stabilizing and protecting thin desert soils.
What is soil crusts?
Long, streamlined hills composed of unsorted glacial till are called __.
What is drumlins?