Our Dynamic Earth

By Boots100

PinkiePie7

bangbang08

Introduction

• This power point will tell you about: The structure of the earth, volcanoes, tsunamis and earthquakes.

• We will also show you some diagrams.

Hope you enjoy!

The structure of the Earth

• The earth has 4 parts to it they are: crust, mantle, outer core and the inner core.

• The crust is a solid rock which has two types which are oceanic and continental.

• The mantle is the widest section of the earth its semi molten rock called magma.

• The outer core is a liquid layer which is made of iron and nickel.

• The inner core is the hottest part of the earth which is solid and made of iron and nickel.

Here Is a Diagram of The Earth

Pacific Ring of Fire

• The Pacific Ring of Fire is an area where lots of earthquakes and volcanic eruptions occur.

• Roughly 90% of earthquakes and 75%of active volcanoes on earth are along the Ring of Fire.

• The shape of the Ring of Fire is not quite a circle it is more like a 40,000 km horse shoe.

Plate Tectonics

• There are three types of plate boundaries

• Divergent

• Convergent

• And transform.

• At the boundaries between plates friction causes them to stick together.

• When built up energy causes them to break or move, earthquakes occur.

Here are Examples of Plate Tectonics

Volcanoes

• Where the earths crust thin or cracked magma flows up to the surface creating a volcano.

• Volcanoes are usually mountains with a bowl in the top called a crater.

• Most eruptions happen in the crater.

• Sometimes lava flows through the vents to.

Volcano Pictures

Earthquakes

• A earthquakes is measured by the strength of shock waves of the Richter scale.

• The scale runs from 1 to 10.• Here is an example of Richter scale• 3-Barely felt, Some Hanging objects may swing.• 5-Felt by all, windows Shatter and walls crack.• 8-Can cause total damage to building,

Landscape changes.

Earthquake Pictures

Tsunami

• A tsunami is a giant ocean wave or a series of waves that can travel for long distances towards land.

• A tsunami is caused by earthquakes, volcanoes or landside happens on the ocean floor, water is displayed. This water forms the start of a tsunami.

Tsunami Pictures

Pompeii

• In August in the year 79, the volcano the Vesuvius starting to erupt after years of sleeping.

• Scientists discovered that the people of Pompeii did not die they froze in weird positions trying to protect themselves from the heat.

Pictures of Pompeii Today