Unit 2 The United States Unit 2 The United States and Canada and Canada

Chapter 3 The United States Chapter 3 The United States

Lesson 2 Physical Feature and ClimateLesson 2 Physical Feature and Climate

What Are the Main What Are the Main Physical Features?Physical Features?

What Did the Ice Age What Did the Ice Age Do?Do?

glacier

lake

Great Lakes Great Lakes Niagara Falls ( 尼亚加拉瀑布 )

How Did the Ice Age How Did the Ice Age Create the Mississippi?Create the Mississippi?

Tributaries

Delta

支流

Where Else Does Where Else Does Water Affect?Water Affect?

hydroelectric power水力发电

The OceansThe OceansLobster龙虾

Red King Crab

Red king crabs are able to grow quite large - the largest king crab on record had a leg span of nearly

five feet across.

Did you know?Did you know?

When a crab grows too big for its shell, it When a crab grows too big for its shell, it sheds its shell by absorbing water and sheds its shell by absorbing water and cracking it, a process called cracking it, a process called moltingmolting. . Juvenile crabsJuvenile crabs molt more often than adult molt more often than adult crabs because they are growing more crabs because they are growing more rapidly; at larger sizes, king crab may skip rapidly; at larger sizes, king crab may skip molt as growth slows. A crab will molt at molt as growth slows. A crab will molt at least 15 to 20 times in its lifetime.least 15 to 20 times in its lifetime.

Until its new shell hardens, a crab that has Until its new shell hardens, a crab that has molted is known as a "molted is known as a "soft-shell crabsoft-shell crab" and " and may be more vulnerable to predation. may be more vulnerable to predation. 

Only Only male crabsmale crabs can legally can legally be caught and sold. In the sbe caught and sold. In the subsistence fishery, where crubsistence fishery, where crabs are caught for personal abs are caught for personal consumption, only males caconsumption, only males can be legally retained.n be legally retained.

Did you know?Did you know?

What Influences What Influences Climate?Climate?

Ocean

latitude

elevation

Landform

Warm and Cold Warm and Cold SeawaterSeawater

Precipitation (Precipitation ( 降水降水 ))

Latitude (Latitude ( 纬度纬度 ) )

Elevation (Elevation ( 高度高度 ))

height Temperature

Landforms (Landforms ( 地形地形 ))

Leewardwindward

Climates Types in Climates Types in the United Statesthe United States

HCCSC

STC

HC

MC

MWCC

How Does Geography How Does Geography Affect People?Affect People?

FloridaFlorida

North DakotaNorth Dakota

How Does Geography How Does Geography Affect People?Affect People?