history of oceanography
what are two important events in history of oceanography?
history home and Polynesian seafarers
What is the outer layer of the Earth?
The outer layer of the Earth is the crust.
what are three basic rules of scuba?
Breathe continuously while on scuba
Equalise early and often while descending
Ascend slowly from every dive and make safety stops
What are the different stages of volcanoes?
active, dormant, and extinct.
What is the largest tectonic plate?
the Pacific Plate
who was the first to study oceanography
prince Henry of Portugal
What are the different parts of the Earth?
crust, mantle, outer core, and inner core.
what is scuba called?
Self-Contained Underwater Breathing Apparatus
How many volcanoes are there?
There are more than 1500 active volcanoes on the Earth.
what causes plates to move?
The heat from radioactive processes within the planet's interior.
what are three reasons to learn the history of oceangraphy?
ancient uses and explorations (5000 b.c -800 A.D)
the middle ages (800-1400)
European voyages of discovery (1400-1700)
How many layers are there in the Earth?
There are 4 layers in Earth.
What is the purpose of scuba?
equipment to allow us to breathe underwater.
What is the difference between lava and magma?
Lava is liquid rock (magma) that flows out of a volcano.
Magma is liquid rock inside a volcano.
Which is the smallest plate?
Juan de Fuca Plate
what are some fun facts about oceangraphy?
ninety percent of all volcanic activity occurs in the oceans.
How deep is the Earth's crust?
Earth's crust ranges from 5 to 60 kilometers, depending on oceanic versus continental crust
Who invented scuba gear?
Jacques Cousteau
what causes a volcano?
When enough magma builds up in the magma chamber.
where is the tectonic plates located?
top of a partially molten layer of rock called the asthenosphere.
why did oceanography develop as a science?
enabled scientists to map the seafloor and examine the organisms that deep waters.
what materials make up the inner core?
made up of primarily iron at 80% and nickel, along with trace amounts of heavy metals.
When was the first scuba dive?
1943
How are volcanoes formed?
Volcanoes are formed when magma from within the Earth’s upper mantle works its way to the surface. At the surface.
why do tectonic plates move slowly?
Convection currents in the mantle