Tides

What are the primary causes of tides?

• Rotation of the Earth

• Magnetic fields from Earth

• Wind patterns

• Gravitational forces from the Moon and the Sun

Name the two main types of tides and briefly explain how they differ.

• Ocean tides and river tides

• High tides and low tides

• Spring tides and neap tides

• Summer tides and winter tides

Describe the tidal patterns of semidiurnal tides.

• Semidiurnal tides only occur in specific regions and not globally.

• Semidiurnal tides have irregular tidal patterns with varying high and low tides.

• Semidiurnal tides exhibit one high tide and one low tide occurring every 24 hours.

• Semidiurnal tides exhibit two high tides and two low tides of similar heights occurring approximately every 12 hours.

How do tidal prediction methods like harmonic analysis help in forecasting tides?

• Harmonic analysis predicts weather patterns instead of tides.

• Tidal prediction methods rely solely on historical data for forecasting.

• Harmonic analysis is not used in predicting tides accurately.

• Harmonic analysis helps in identifying recurring patterns and gravitational influences to forecast tides accurately.

Discuss some of the effects of tides on coastal areas and marine life.

• Tides result in a decrease in water levels

• Tides cause an increase in marine life population

• Tides can cause erosion, flooding, changes in water levels, and impact marine life movement and feeding patterns.

• Tides have no impact on coastal areas and marine life

Explain the terms 'spring tide' and 'neap tide'.

• Spring tide and neap tide are related to the alignment of the sun, moon, and Earth, affecting the gravitational forces that cause tides.

• Spring tide is caused by the Earth being closer to the sun, while neap tide is caused by the moon being farther away.

• Spring tide occurs during the new moon phase, while neap tide occurs during the full moon phase.

• Spring tide results in lower high tides and higher low tides, while neap tide results in higher high tides and lower low tides.

How does the concept of tidal range relate to the height difference between high and low tides?

• Tidal range is the time difference between high and low tides.

• Tidal range is the speed of the tides.

• Tidal range is the distance between high and low tides.

• Tidal range is the height difference between high and low tides.

What is the significance of the tidal datum in tide predictions?

• Tidal datum is used to predict weather patterns

• Tidal datum serves as the reference level for measuring tidal heights.

• Tidal datum indicates the time of high tide

• Tidal datum measures the speed of ocean currents

Define the term 'ebb tide' and explain its occurrence.

• Ebb tide is a term used for calm sea conditions.

• Ebb tide is when the tide is rising rapidly.

• Ebb tide is the period when the tide is receding or going out, usually after high tide.

• Ebb tide occurs during low tide.

How do tidal bores differ from regular tides and what causes them?

• Tidal bores occur due to the temperature difference between the ocean and the atmosphere

• Tidal bores are caused by underwater volcanic activity

• Tidal bores are caused by the collision of the incoming tide with a river's current, creating a sudden surge of water.

• Tidal bores are caused by the moon's gravitational pull on the Earth's oceans