شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس خامسة ابتدائي - ترم ثاني

لينك تحميل الملزمة
https://drive.google.com/file/d/1EX-YFZeQAi324dChb8ocwdXArDmSLtLA/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
Types of Aquatic Ecosystems
Aquatic ecosystems on Earth can be classified in different ways such as, they can
be classified into:
- Saltwater ecosystems. - Freshwater ecosystems.
1. Saltwater ecosystems
• Oceans are the largest saltwater ecosystems that cover large parts of Earth's surface.
Saltwater ecosystems of oceans and seas include :
Shallow areas: These areas contain coral reefs and intertidal ones .
Deep areas: These areas are called abyssal zones which are very deep areas in oceans, so that sunlight cannot reach them.

Saltwater lakes:
- Some lakes have salt water.
- Lake Assal in Djibouti is an example of saltwater ecosystem.
- Lake Assal has a high concentration of natural salts, so it is too salty for fish and most aquatic animals to live in also, there are few plants that can grow in this area.
- There are many different types of bacteria live in Lake Assal.

 2. Freshwater ecosystems
Freshwater ecosystems include:
Ponds and lakes:
- In many ponds and lakes, the water is present all year.
- Some other ponds and lakes dry up in the hot summer months, so animals and plants that live there must adapt to the changes that happen in these ponds and lakes to survive.
Example of freshwater lakes : Lake Nasser in Egypt.

Flowing water bodies:
- They include rivers and streams (streams are small bodies of flowing water).
- Water is always moving in the flowing water bodies.
- Many different plants and animals live in flowing water bodies.

بالتوفيق
مستر احمد الباشا