تلخيص Fossils العلوم منهج انجليزي الصف الثالث

البيانات

تلخيص Fossils العلوم منهج انجليزي الصف الثالث


Change the environment

Fossils

The remains Of organisms from the past or a trace Of the remains Of a living thing that died long ago

Extinction

when there is no more of an organism's kind left on Earth An example of this is a dinosaur - the mammoth and the dodo

. Animals and plants become extinct because (Their environment changed and they could not survive any more)

Trace fossils

Sometime an animal leaves a footprint on the ground as it walk an imprint in mud or clay

Preserved remains

the actual remains of an organism trapped in earths materials such as tree sap , tar and ice

Molds

the shell - shaped space that is left

Casts

the empty space can be filled with a new materia

Types of fossils and examples of them

 

Fossils that are buried close to the surface are younger than fossils buried deep in the ground

Fossils buried deep in the earth are considered older than those buried near the surface

Fossils can tell us how the Earth's environment has changed over time

Fish fossils that are found on land most likely mean

( the land used to be covered with water / ZS

deep a fossil is buried gives scientists clues about its age

When there are not many of one kind of animal left, the animal is considered endangere

If not enough is done for a species that is endangered, then it ma become extinct

 

Change affect organisms

Invasive Species

An organism that is introduced into a new environment either by accident or on purpose by humans

Ecosystem

the interaction Of living and non - living things in the environment

When plants and animals cannot adapt to their environment, their population dies off

A farmer accidentally planted seeds of an invasive species in his field. How is the plant harmful to the environment

It blocks sunlight and takes nutrients that native plants need

An environment can be changed by a flood , which washes away soil and plants Which could happen if people introduced a new animal into an environment

The animal uses up resources. -bidl Which is one way humans endanger animals Clearing rain

Which are reasons that an animal may become extinct

( loss of habitat - pollution - huntingæ)

 

Weather pattems

Weather

What the air is like outside at a certain time and place

Atmosphere

Is a blanket of gases and tiny bits of dust that surround earth

Temperature

Measure of how hot or cold something

Precipitation

Water that fall to the ground from cloud

Air pressure

Force of air pressing down on earths surface

wind

Moving air

Precipitation, wind, and air pressure are all ways to describe the weather

kind of precipitation might fall on a very cold day snow , sleet and hail

A type of precipitation that may fall on a warm day in the form of rain

Temperatures get cold as they go higher in the atmosphere

 

Weather and season

Climate

Is pattern of weather in a certain place over time

Seasons

Are time Of the year with different weather pattern

Axis

An imaginary line that runs through the center of the earth

Different seasons are caused by the spinning of the Earth on an imaginary line called its axis

Earth has four seasons

Places high up in the mountains tend to have colder climates than lower areas

A cold and wet climate will probably receive a lot of precipitation

Because of the Earth's tilt , the Sun's rays strike the Earth at different angles

A storm with lots Of snow, cold temperatures, and strong winds is called a blizzard

best describes climate average precipitation and temperature

Winter

Temperature cold

Spring

Temperature warm

windy

Summer

Temperature hot
sunny

fall

Temperature

sunny

 

Natural hazards and the environment

Natural hazard

Is a natural event such as a flood , earthquake, or hurricane that causes great damage

Earthquake

Is a shaking of earth's surface. earthquake are caused by movement in earths crust

Flood

Water that flows over land that is normally dry

Landslides

IS the rapid movement Of rocks and soil down hill Or mountain

Earthquake

Movement in earth crust

A hurricane Often causes a flood

Flood

high rain

Melting snow

hurricanes

Landslides

Gravity

earthquake

 An earthquake causes vibration that are strongest near the center

Flash floods are floods that happen with a very fast rise in water level

 A large storm that forms over an ocean is called a hurricane

 A storm with lots Of snow, cold

temperatures, and strong winds is called a blizzard

 A storm with lots of snow, cold temperatures, and strong winds is called a blizzard

 Wildfires can occur from lightning strikes in the forest

 Buildings, bridges, roads and crops may be washed away

 

Prepare for Natural hazards

جدار الفيضان Floodwalls

Are wall built to reduce or prevent flooding in an area

هي عبارة عن جدار مبني لتقليل أو منع الفيضانات في منطقة ما

سد Levee

Is a wall built along the side Of rivers and Other bodies Of water to prevent them from overflowing

هو جدار تم بناؤه على طول جانب الأنهار والمسطحات المائية الأخرى لمنع فيضانها

مانعة الصواعق Lightning rod

Is a metal bar that safely directs lightning into the ground

هو قضيب معدني يوجه البرق بأمان إلى الأرض

A path that can reduce the damage a hurricane can cause

مسار يمكن أن يقلل الضرر الذي يمكن أن يسببه الإعصار

Some homeowners build their homes on higher ground or on raised platforms to prevent flooding

Flood walls can be reinforced using permanent or temporary methods

Windows can be taped to prevent them from splitting into many dangerous pieces

The lightning rod may prevent fires Evacuation of an area before a hurricane can be a way to stay safe from harm

Lightning hits the lightning rod on the building instead Of hitting the building

Levees can be used to prevent damage from floods

The best building structure that will help it to resist earthquake is a wooden building or a building with a flexiue foundation that absorbs vibrations

 افضل هيكل مبنى سيساعده على مقاومة الزلزال مبنى لخشبي أو مبنى ذات اساس مرن ماص للاهتزاز
 

شارك الملف

آخر الملفات المضافة

أكثر الملفات تحميلا