Ca Geology Ppt L#9

Front 1

Three main types of deserts in California.

Back 1

Mono Lake, Death Valley, Mojave National Preserve.

Front 2

Desert are on the ____ of mountain ranges. ___ and ___ are what controls the California Deserts.
Wind pushes up the mountains. It gets ___ as you move up mountains and the __ makes it lose moisture, so it begins to drop their water. The backside of the mountain loses water.

Back 2

back side;

Orographic lifting; Rain Shadow Effects;

colder; cold;

Front 3

Most storms come from ___ and ___. Not all though. Some come from the South from the Gulf of Mexico.

Back 3

West and Northwest

Front 4

__ are anomalies. CA gets hit with it periodically. Tropical storms sometimes waterhoses itself to CA. 10 feet of water is possible. Account for about __ of CA's annual total water supply. Responsible for most major severe precipitation events and floods.

Back 4

Atmospheric River; 40%;

Front 5

Water that does get to the deserts typically flows to the low spots forming ___. They dry and leave behind __ and normally soluble minerals at or near surface in deserts. These are __ or __.

Back 5

ephemeral lakes; salts;

salt flats or playas;

Front 6

What do you need to make a sand dune?

Back 6

1. Winds of sufficient speed (to transport grains)

2. Little or no vegetation (because plant roots are effective at anchoring & stabilizing sand. This is why you don't destroy vegetation that is growing on sand dunes!)

3. Need SAND!

Front 7

Why should I care about how a sand dune works?*

Back 7

Because some day you may buy a house or develop property and Sometimes unintended consequences can bite you.

Front 8

Deserts have water issues with ___ in steep-walled desert canyons.

Back 8

flash floods;

Front 9

Castle Bravo the first U.S. test of a dry fuel thermonuclear hydrogen bomb March 1, 1954 at Bikini Atoll, Marshall Islands. Radioactive stuff has gotten on ocean. What is the point?

Back 9

The recovery capacity of the planet is high. Everything turned out okay.

Front 10

Seasonal weather storms affect the North and South coastlines differently. ___ affects the North coastline surf while ___ affects the South coastline surf. Oceans have complex circulatory systems. The ocean is homogeneous.

Back 10

Winter storms; Summer storms

Front 11

Lots of action under water. ____ “Hijack” sand/dirt/mud and transport offshore to great depths.They go from shallow near shore to REALLY DEEP.

Back 11

Submarine canyons

Front 12

As water reaches towards shore, velocity ___ and the height of surf waves __. As the wave begins to touch the bottom of the ocean more, the wavelength ___. Breakers form as approaching shore.

Back 12

decrease; increase;

Shortens;

Front 13

Tsunamis travel 200 to 400+ mph in open ocean. (NOAA). They slow down and pile up when they “feel” the bottom of the ocean and will hit the shore at around 20 mph.

Back 13

Front 14

Over geologic time __ beats rock! Ex. Half Moon Bay and state highway.

Back 14

water

Front 15

During winter storms, waves move much of the sand to offshore bars.

Back 15

Front 16

Where does the sand come from? What are unintended consequences of damming up rivers and streams?

Back 16

Rivers and streams;

Beach erosion;

Front 17

longshore currents are created by obliquely breaking waves. These currents transfer sand along the beach and in the surf zone.

Back 17